Merge branch '3.4RC'3.4

8 files changed, 383 insertions, 335 deletions

diff --git a/vendor/michelf/php-markdown/.gitignore b/vendor/michelf/php-markdown/.gitignore
new file mode 100644
index 000000000..5bd6475b7
--- /dev/null
+++ b/vendor/michelf/php-markdown/.gitignore
@@ -0,0 +1,3 @@
+*~
+/composer.lock
+/vendor/
diff --git a/vendor/michelf/php-markdown/License.md b/vendor/michelf/php-markdown/License.md
index c16197b69..b3df08f99 100644
--- a/vendor/michelf/php-markdown/License.md
+++ b/vendor/michelf/php-markdown/License.md
@@ -1,11 +1,11 @@
 PHP Markdown Lib  
-Copyright (c) 2004-2016 Michel Fortin  
+Copyright (c) 2004-2018 Michel Fortin
 <https://michelf.ca/>  
 All rights reserved.
 
 Based on Markdown  
-Copyright (c) 2003-2006 John Gruber   
-<https://daringfireball.net/>   
+Copyright (c) 2003-2006 John Gruber  
+<https://daringfireball.net/>  
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without
diff --git a/vendor/michelf/php-markdown/Michelf/Markdown.php b/vendor/michelf/php-markdown/Michelf/Markdown.php
index c3eaf4464..e4c2c2361 100644
--- a/vendor/michelf/php-markdown/Michelf/Markdown.php
+++ b/vendor/michelf/php-markdown/Michelf/Markdown.php
@@ -4,7 +4,7 @@
  *
  * @package   php-markdown
  * @author    Michel Fortin <michel.fortin@michelf.com>
- * @copyright 2004-2016 Michel Fortin <https://michelf.com/projects/php-markdown/>
+ * @copyright 2004-2018 Michel Fortin <https://michelf.com/projects/php-markdown/>
  * @copyright (Original Markdown) 2004-2006 John Gruber <https://daringfireball.net/projects/markdown/>
  */
 
@@ -18,7 +18,7 @@ class Markdown implements MarkdownInterface {
 	 * Define the package version
 	 * @var string
 	 */
-	const MARKDOWNLIB_VERSION = "1.7.0";
+	const MARKDOWNLIB_VERSION = "1.8.0";
 
 	/**
 	 * Simple function interface - Initialize the parser and return the result
@@ -61,14 +61,14 @@ class Markdown implements MarkdownInterface {
 	 * @var int
 	 */
 	public $tab_width = 4;
-	
+
 	/**
 	 * Change to `true` to disallow markup or entities.
 	 * @var boolean
 	 */
 	public $no_markup   = false;
 	public $no_entities = false;
-	
+
 
 	/**
 	 * Change to `true` to enable line breaks on \n without two trailling spaces
@@ -94,7 +94,7 @@ class Markdown implements MarkdownInterface {
 	 * @var callable
 	 */
 	public $header_id_func = null;
-	
+
 	/**
 	 * Optional function for converting code block content to HTML
 	 * @var callable
@@ -111,7 +111,7 @@ class Markdown implements MarkdownInterface {
 	 * Class attribute to toggle "enhanced ordered list" behaviour
 	 * setting this to true will allow ordered lists to start from the index
 	 * number that is defined first.
-	 * 
+	 *
 	 * For example:
 	 * 2. List item two
 	 * 3. List item three
@@ -155,17 +155,17 @@ class Markdown implements MarkdownInterface {
 	public function __construct() {
 		$this->_initDetab();
 		$this->prepareItalicsAndBold();
-	
-		$this->nested_brackets_re = 
+
+		$this->nested_brackets_re =
 			str_repeat('(?>[^\[\]]+|\[', $this->nested_brackets_depth).
 			str_repeat('\])*', $this->nested_brackets_depth);
-	
-		$this->nested_url_parenthesis_re = 
+
+		$this->nested_url_parenthesis_re =
 			str_repeat('(?>[^()\s]+|\(', $this->nested_url_parenthesis_depth).
 			str_repeat('(?>\)))*', $this->nested_url_parenthesis_depth);
-		
+
 		$this->escape_chars_re = '['.preg_quote($this->escape_chars).']';
-		
+
 		// Sort document, block, and span gamut in ascendent priority order.
 		asort($this->document_gamut);
 		asort($this->block_gamut);
@@ -180,13 +180,19 @@ class Markdown implements MarkdownInterface {
 	protected $urls        = array();
 	protected $titles      = array();
 	protected $html_hashes = array();
-	
+
 	/**
 	 * Status flag to avoid invalid nesting.
 	 * @var boolean
 	 */
 	protected $in_anchor = false;
-	
+
+	/**
+	 * Status flag to avoid invalid nesting.
+	 * @var boolean
+	 */
+	protected $in_emphasis_processing = false;
+
 	/**
 	 * Called before the transformation process starts to setup parser states.
 	 * @return void
@@ -197,8 +203,9 @@ class Markdown implements MarkdownInterface {
 		$this->titles      = $this->predef_titles;
 		$this->html_hashes = array();
 		$this->in_anchor   = false;
+		$this->in_emphasis_processing = false;
 	}
-	
+
 	/**
 	 * Called after the transformation process to clear any variable which may
 	 * be taking up memory unnecessarly.
@@ -221,7 +228,7 @@ class Markdown implements MarkdownInterface {
 	 */
 	public function transform($text) {
 		$this->setup();
-	
+
 		# Remove UTF-8 BOM and marker character in input, if present.
 		$text = preg_replace('{^\xEF\xBB\xBF|\x1A}', '', $text);
 
@@ -248,7 +255,7 @@ class Markdown implements MarkdownInterface {
 		foreach ($this->document_gamut as $method => $priority) {
 			$text = $this->$method($text);
 		}
-		
+
 		$this->teardown();
 
 		return $text . "\n";
@@ -271,7 +278,7 @@ class Markdown implements MarkdownInterface {
 	 * @return string
 	 */
 	protected function stripLinkDefinitions($text) {
-	
+
 		$less_than_tab = $this->tab_width - 1;
 
 		// Link defs are in the form: ^[id]: url "optional title"
@@ -338,8 +345,8 @@ class Markdown implements MarkdownInterface {
 		 * for is hard-coded:
 		 *
 		 * *  List "a" is made of tags which can be both inline or block-level.
-		 *    These will be treated block-level when the start tag is alone on 
-		 *    its line, otherwise they're not matched here and will be taken as 
+		 *    These will be treated block-level when the start tag is alone on
+		 *    its line, otherwise they're not matched here and will be taken as
 		 *    inline later.
 		 * *  List "b" is made of tags which are always block-level;
 		 */
@@ -363,7 +370,7 @@ class Markdown implements MarkdownInterface {
 			  |
 				\'[^\']*\'	# text inside single quotes (tolerate ">")
 			  )*
-			)?	
+			)?
 			';
 		$content =
 			str_repeat('
@@ -380,7 +387,7 @@ class Markdown implements MarkdownInterface {
 			str_repeat('
 					  </\2\s*>	# closing nested tag
 					)
-				  |				
+				  |
 					<(?!/\2\s*>	# other tags with a different name
 				  )
 				)*',
@@ -409,9 +416,9 @@ class Markdown implements MarkdownInterface {
 			)
 			(						# save in $1
 
-			  # Match from `\n<tag>` to `</tag>\n`, handling nested tags 
+			  # Match from `\n<tag>` to `</tag>\n`, handling nested tags
 			  # in between.
-					
+
 						[ ]{0,'.$less_than_tab.'}
 						<('.$block_tags_b_re.')# start tag = $2
 						'.$attr.'>			# attributes followed by > and \n
@@ -429,28 +436,28 @@ class Markdown implements MarkdownInterface {
 						</\3>				# the matching end tag
 						[ ]*				# trailing spaces/tabs
 						(?=\n+|\Z)	# followed by a newline or end of document
-					
-			| # Special case just for <hr />. It was easier to make a special 
+
+			| # Special case just for <hr />. It was easier to make a special
 			  # case than to make the other regex more complicated.
-			
+
 						[ ]{0,'.$less_than_tab.'}
 						<(hr)				# start tag = $2
 						'.$attr.'			# attributes
 						/?>					# the matching end tag
 						[ ]*
 						(?=\n{2,}|\Z)		# followed by a blank line or end of document
-			
+
 			| # Special case for standalone HTML comments:
-			
+
 					[ ]{0,'.$less_than_tab.'}
 					(?s:
 						<!-- .*? -->
 					)
 					[ ]*
 					(?=\n{2,}|\Z)		# followed by a blank line or end of document
-			
+
 			| # PHP and ASP-style processor instructions (<? and <%)
-			
+
 					[ ]{0,'.$less_than_tab.'}
 					(?s:
 						<([?%])			# $2
@@ -459,7 +466,7 @@ class Markdown implements MarkdownInterface {
 					)
 					[ ]*
 					(?=\n{2,}|\Z)		# followed by a blank line or end of document
-					
+
 			)
 			)}Sxmi',
 			array($this, '_hashHTMLBlocks_callback'),
@@ -479,9 +486,9 @@ class Markdown implements MarkdownInterface {
 		$key  = $this->hashBlock($text);
 		return "\n\n$key\n\n";
 	}
-	
+
 	/**
-	 * Called whenever a tag must be hashed when a function insert an atomic 
+	 * Called whenever a tag must be hashed when a function insert an atomic
 	 * element in the text stream. Passing $text to through this function gives
 	 * a unique text-token which will be reverted back when calling unhash.
 	 *
@@ -498,7 +505,7 @@ class Markdown implements MarkdownInterface {
 		// Swap back any tag hash found in $text so we do not have to `unhash`
 		// multiple times at the end.
 		$text = $this->unhash($text);
-		
+
 		// Then hash the block.
 		static $i = 0;
 		$key = "$boundary\x1A" . ++$i . $boundary;
@@ -531,10 +538,10 @@ class Markdown implements MarkdownInterface {
 	/**
 	 * Run block gamut tranformations.
 	 *
-	 * We need to escape raw HTML in Markdown source before doing anything 
-	 * else. This need to be done for each block, and not only at the 
+	 * We need to escape raw HTML in Markdown source before doing anything
+	 * else. This need to be done for each block, and not only at the
 	 * begining in the Markdown function since hashed blocks can be part of
-	 * list items and could have been indented. Indented blocks would have 
+	 * list items and could have been indented. Indented blocks would have
 	 * been seen as a code block in a previous pass of hashHTMLBlocks.
 	 *
 	 * @param  string $text
@@ -546,7 +553,7 @@ class Markdown implements MarkdownInterface {
 	}
 
 	/**
-	 * Run block gamut tranformations, without hashing HTML blocks. This is 
+	 * Run block gamut tranformations, without hashing HTML blocks. This is
 	 * useful when HTML blocks are known to be already hashed, like in the first
 	 * whole-document pass.
 	 *
@@ -554,11 +561,11 @@ class Markdown implements MarkdownInterface {
 	 * @return string
 	 */
 	protected function runBasicBlockGamut($text) {
-	
+
 		foreach ($this->block_gamut as $method => $priority) {
 			$text = $this->$method($text);
 		}
-		
+
 		// Finally form paragraph and restore hashed blocks.
 		$text = $this->formParagraphs($text);
 
@@ -582,7 +589,7 @@ class Markdown implements MarkdownInterface {
 				[ ]*		# Tailing spaces
 				$			# End of line.
 			}mx',
-			"\n".$this->hashBlock("<hr$this->empty_element_suffix")."\n", 
+			"\n".$this->hashBlock("<hr$this->empty_element_suffix")."\n",
 			$text
 		);
 	}
@@ -629,10 +636,10 @@ class Markdown implements MarkdownInterface {
 	 */
 	protected function doHardBreaks($text) {
 		if ($this->hard_wrap) {
-			return preg_replace_callback('/ *\n/', 
+			return preg_replace_callback('/ *\n/',
 				array($this, '_doHardBreaks_callback'), $text);
 		} else {
-			return preg_replace_callback('/ {2,}\n/', 
+			return preg_replace_callback('/ {2,}\n/',
 				array($this, '_doHardBreaks_callback'), $text);
 		}
 	}
@@ -656,7 +663,7 @@ class Markdown implements MarkdownInterface {
 			return $text;
 		}
 		$this->in_anchor = true;
-		
+
 		// First, handle reference-style links: [link text] [id]
 		$text = preg_replace_callback('{
 			(					# wrap whole match in $1
@@ -729,7 +736,7 @@ class Markdown implements MarkdownInterface {
 			// for shortcut links like [this][] or [this].
 			$link_id = $link_text;
 		}
-		
+
 		// lower-case and turn embedded newlines into spaces
 		$link_id = strtolower($link_id);
 		$link_id = preg_replace('{[ ]?\n}', ' ', $link_id);
@@ -737,14 +744,14 @@ class Markdown implements MarkdownInterface {
 		if (isset($this->urls[$link_id])) {
 			$url = $this->urls[$link_id];
 			$url = $this->encodeURLAttribute($url);
-			
+
 			$result = "<a href=\"$url\"";
 			if ( isset( $this->titles[$link_id] ) ) {
 				$title = $this->titles[$link_id];
 				$title = $this->encodeAttribute($title);
 				$result .=  " title=\"$title\"";
 			}
-		
+
 			$link_text = $this->runSpanGamut($link_text);
 			$result .= ">$link_text</a>";
 			$result = $this->hashPart($result);
@@ -779,7 +786,7 @@ class Markdown implements MarkdownInterface {
 			$title = $this->encodeAttribute($title);
 			$result .=  " title=\"$title\"";
 		}
-		
+
 		$link_text = $this->runSpanGamut($link_text);
 		$result .= ">$link_text</a>";
 
@@ -807,7 +814,7 @@ class Markdown implements MarkdownInterface {
 			  \]
 
 			)
-			}xs', 
+			}xs',
 			array($this, '_doImages_reference_callback'), $text);
 
 		// Next, handle inline images:  ![alt text](url "optional title")
@@ -906,7 +913,7 @@ class Markdown implements MarkdownInterface {
 		 * Setext-style headers:
 		 *	  Header 1
 		 *	  ========
-		 *  
+		 *
 		 *	  Header 2
 		 *	  --------
 		 */
@@ -944,7 +951,7 @@ class Markdown implements MarkdownInterface {
 		if ($matches[2] == '-' && preg_match('{^-(?: |$)}', $matches[1])) {
 			return $matches[0];
 		}
-		
+
 		$level = $matches[2]{0} == '=' ? 1 : 2;
 
 		// ID attribute generation
@@ -977,7 +984,7 @@ class Markdown implements MarkdownInterface {
 	 * @param  string $headerValue
 	 * @return string
 	 */
-	protected function _generateIdFromHeaderValue($headerValue) {		
+	protected function _generateIdFromHeaderValue($headerValue) {
 		if (!is_callable($this->header_id_func)) {
 			return "";
 		}
@@ -1035,10 +1042,10 @@ class Markdown implements MarkdownInterface {
 				  )
 				)
 			'; // mx
-			
+
 			// We use a different prefix before nested lists than top-level lists.
 			//See extended comment in _ProcessListItems().
-		
+
 			if ($this->list_level) {
 				$text = preg_replace_callback('{
 						^
@@ -1132,7 +1139,7 @@ class Markdown implements MarkdownInterface {
 		 * without resorting to mind-reading. Perhaps the solution is to
 		 * change the syntax rules such that sub-lists must start with a
 		 * starting cardinal number; e.g. "1." or "a.".
-		 */		
+		 */
 		$this->list_level++;
 
 		// Trim trailing blank lines:
@@ -1166,7 +1173,7 @@ class Markdown implements MarkdownInterface {
 		$marker_space = $matches[3];
 		$tailing_blank_line =& $matches[5];
 
-		if ($leading_line || $tailing_blank_line || 
+		if ($leading_line || $tailing_blank_line ||
 			preg_match('/\n{2,}/', $item))
 		{
 			// Replace marker with the appropriate whitespace indentation
@@ -1273,7 +1280,7 @@ class Markdown implements MarkdownInterface {
 	 * @var array
 	 */
 	protected $em_strong_prepared_relist;
-	
+
 	/**
 	 * Prepare regular expressions for searching emphasis tokens in any
 	 * context.
@@ -1289,7 +1296,7 @@ class Markdown implements MarkdownInterface {
 				}
 				$token_relist[] = $em_re;
 				$token_relist[] = $strong_re;
-				
+
 				// Construct master expression from list.
 				$token_re = '{(' . implode('|', $token_relist) . ')}';
 				$this->em_strong_prepared_relist["$em$strong"] = $token_re;
@@ -1303,24 +1310,29 @@ class Markdown implements MarkdownInterface {
 	 * @return string
 	 */
 	protected function doItalicsAndBold($text) {
+		if ($this->in_emphasis_processing) {
+			return $text; // avoid reentrency
+		}
+		$this->in_emphasis_processing = true;
+
 		$token_stack = array('');
 		$text_stack = array('');
 		$em = '';
 		$strong = '';
 		$tree_char_em = false;
-		
+
 		while (1) {
 			// Get prepared regular expression for seraching emphasis tokens
 			// in current context.
 			$token_re = $this->em_strong_prepared_relist["$em$strong"];
-			
-			// Each loop iteration search for the next emphasis token. 
+
+			// Each loop iteration search for the next emphasis token.
 			// Each token is then passed to handleSpanToken.
 			$parts = preg_split($token_re, $text, 2, PREG_SPLIT_DELIM_CAPTURE);
 			$text_stack[0] .= $parts[0];
 			$token =& $parts[1];
 			$text =& $parts[2];
-			
+
 			if (empty($token)) {
 				// Reached end of text span: empty stack without emitting.
 				// any more emphasis.
@@ -1330,7 +1342,7 @@ class Markdown implements MarkdownInterface {
 				}
 				break;
 			}
-			
+
 			$token_len = strlen($token);
 			if ($tree_char_em) {
 				// Reached closing marker while inside a three-char emphasis.
@@ -1369,7 +1381,7 @@ class Markdown implements MarkdownInterface {
 						$$tag = ''; // $$tag stands for $em or $strong
 					}
 				} else {
-					// Reached opening three-char emphasis marker. Push on token 
+					// Reached opening three-char emphasis marker. Push on token
 					// stack; will be handled by the special condition above.
 					$em = $token{0};
 					$strong = "$em$em";
@@ -1383,6 +1395,7 @@ class Markdown implements MarkdownInterface {
 					if (strlen($token_stack[0]) == 1) {
 						$text_stack[1] .= array_shift($token_stack);
 						$text_stack[0] .= array_shift($text_stack);
+						$em = '';
 					}
 					// Closing strong marker:
 					array_shift($token_stack);
@@ -1417,6 +1430,7 @@ class Markdown implements MarkdownInterface {
 				}
 			}
 		}
+		$this->in_emphasis_processing = false;
 		return $text_stack[0];
 	}
 
@@ -1453,9 +1467,9 @@ class Markdown implements MarkdownInterface {
 		$bq = $this->runBlockGamut($bq); // recurse
 
 		$bq = preg_replace('/^/m', "  ", $bq);
-		// These leading spaces cause problem with <pre> content, 
+		// These leading spaces cause problem with <pre> content,
 		// so we need to fix that:
-		$bq = preg_replace_callback('{(\s*<pre>.+?</pre>)}sx', 
+		$bq = preg_replace_callback('{(\s*<pre>.+?</pre>)}sx',
 			array($this, '_doBlockQuotes_callback2'), $bq);
 
 		return "\n" . $this->hashBlock("<blockquote>\n$bq\n</blockquote>") . "\n\n";
@@ -1525,7 +1539,7 @@ class Markdown implements MarkdownInterface {
 //					// We can't call Markdown(), because that resets the hash;
 //					// that initialization code should be pulled into its own sub, though.
 //					$div_content = $this->hashHTMLBlocks($div_content);
-//					
+//
 //					// Run document gamut methods on the content.
 //					foreach ($this->document_gamut as $method => $priority) {
 //						$div_content = $this->$method($div_content);
@@ -1582,9 +1596,9 @@ class Markdown implements MarkdownInterface {
 
 		return $url;
 	}
-	
+
 	/**
-	 * Smart processing for ampersands and angle brackets that need to 
+	 * Smart processing for ampersands and angle brackets that need to
 	 * be encoded. Valid character entities are left alone unless the
 	 * no-entities mode is set.
 	 * @param  string $text
@@ -1596,7 +1610,7 @@ class Markdown implements MarkdownInterface {
 		} else {
 			// Ampersand-encoding based entirely on Nat Irons's Amputator
 			// MT plugin: <http://bumppo.net/projects/amputator/>
-			$text = preg_replace('/&(?!#?[xX]?(?:[0-9a-fA-F]+|\w+);)/', 
+			$text = preg_replace('/&(?!#?[xX]?(?:[0-9a-fA-F]+|\w+);)/',
 								'&amp;', $text);
 		}
 		// Encode remaining <'s
@@ -1724,7 +1738,7 @@ class Markdown implements MarkdownInterface {
 	 */
 	protected function parseSpan($str) {
 		$output = '';
-		
+
 		$span_re = '{
 				(
 					\\\\'.$this->escape_chars_re.'
@@ -1752,16 +1766,16 @@ class Markdown implements MarkdownInterface {
 				}xs';
 
 		while (1) {
-			// Each loop iteration seach for either the next tag, the next 
-			// openning code span marker, or the next escaped character. 
+			// Each loop iteration seach for either the next tag, the next
+			// openning code span marker, or the next escaped character.
 			// Each token is then passed to handleSpanToken.
 			$parts = preg_split($span_re, $str, 2, PREG_SPLIT_DELIM_CAPTURE);
-			
+
 			// Create token from text preceding tag.
 			if ($parts[0] != "") {
 				$output .= $parts[0];
 			}
-			
+
 			// Check if we reach the end.
 			if (isset($parts[1])) {
 				$output .= $this->handleSpanToken($parts[1], $parts[2]);
@@ -1770,7 +1784,7 @@ class Markdown implements MarkdownInterface {
 				break;
 			}
 		}
-		
+
 		return $output;
 	}
 
@@ -1787,7 +1801,7 @@ class Markdown implements MarkdownInterface {
 				return $this->hashPart("&#". ord($token{1}). ";");
 			case "`":
 				// Search for end marker in remaining text.
-				if (preg_match('/^(.*?[^`])'.preg_quote($token).'(?!`)(.*)$/sm', 
+				if (preg_match('/^(.*?[^`])'.preg_quote($token).'(?!`)(.*)$/sm',
 					$str, $matches))
 				{
 					$str = $matches[2];
@@ -1823,11 +1837,11 @@ class Markdown implements MarkdownInterface {
 	 * For each line we separate the line in blocks delemited by tab characters.
 	 * Then we reconstruct every line by adding the  appropriate number of space
 	 * between each blocks.
-	 * 
+	 *
 	 * @param  string $text
 	 * @return string
 	 */
-	protected function detab($text) {	
+	protected function detab($text) {
 		$text = preg_replace_callback('/^.*\t.*$/m',
 			array($this, '_detab_callback'), $text);
 
@@ -1842,7 +1856,7 @@ class Markdown implements MarkdownInterface {
 	protected function _detab_callback($matches) {
 		$line = $matches[0];
 		$strlen = $this->utf8_strlen; // strlen function for UTF-8.
-		
+
 		// Split in blocks.
 		$blocks = explode("\t", $line);
 		// Add each blocks to the line.
@@ -1850,7 +1864,7 @@ class Markdown implements MarkdownInterface {
 		unset($blocks[0]); // Do not add first block twice.
 		foreach ($blocks as $block) {
 			// Calculate amount of space, insert spaces, insert block.
-			$amount = $this->tab_width - 
+			$amount = $this->tab_width -
 				$strlen($line, 'UTF-8') % $this->tab_width;
 			$line .= str_repeat(" ", $amount) . $block;
 		}
@@ -1859,20 +1873,20 @@ class Markdown implements MarkdownInterface {
 
 	/**
 	 * Check for the availability of the function in the `utf8_strlen` property
-	 * (initially `mb_strlen`). If the function is not available, create a 
+	 * (initially `mb_strlen`). If the function is not available, create a
 	 * function that will loosely count the number of UTF-8 characters with a
 	 * regular expression.
 	 * @return void
 	 */
 	protected function _initDetab() {
-	
+
 		if (function_exists($this->utf8_strlen)) {
 			return;
 		}
 
-		$this->utf8_strlen = create_function('$text', 'return preg_match_all(
-			"/[\\\\x00-\\\\xBF]|[\\\\xC0-\\\\xFF][\\\\x80-\\\\xBF]*/", 
-			$text, $m);');
+		$this->utf8_strlen = function($text) {
+			return preg_match_all('/[\x00-\xBF]|[\xC0-\xFF][\x80-\xBF]*/', $text, $m);
+		};
 	}
 
 	/**
@@ -1881,7 +1895,7 @@ class Markdown implements MarkdownInterface {
 	 * @return string
 	 */
 	protected function unhash($text) {
-		return preg_replace_callback('/(.)\x1A[0-9]+\1/', 
+		return preg_replace_callback('/(.)\x1A[0-9]+\1/',
 			array($this, '_unhash_callback'), $text);
 	}
 
diff --git a/vendor/michelf/php-markdown/Michelf/MarkdownExtra.php b/vendor/michelf/php-markdown/Michelf/MarkdownExtra.php
index ac6b1b4f2..a8f7f2c5d 100644
--- a/vendor/michelf/php-markdown/Michelf/MarkdownExtra.php
+++ b/vendor/michelf/php-markdown/Michelf/MarkdownExtra.php
@@ -4,7 +4,7 @@
  *
  * @package   php-markdown
  * @author    Michel Fortin <michel.fortin@michelf.com>
- * @copyright 2004-2016 Michel Fortin <https://michelf.com/projects/php-markdown/>
+ * @copyright 2004-2018 Michel Fortin <https://michelf.com/projects/php-markdown/>
  * @copyright (Original Markdown) 2004-2006 John Gruber <https://daringfireball.net/projects/markdown/>
  */
 
@@ -23,14 +23,14 @@ class MarkdownExtra extends \Michelf\Markdown {
 	 * @var string
 	 */
 	public $fn_id_prefix = "";
-	
+
 	/**
 	 * Optional title attribute for footnote links and backlinks.
 	 * @var string
 	 */
 	public $fn_link_title     = "";
 	public $fn_backlink_title = "";
-	
+
 	/**
 	 * Optional class attribute for footnote links and backlinks.
 	 * @var string
@@ -74,19 +74,25 @@ class MarkdownExtra extends \Michelf\Markdown {
 	public $predef_abbr = array();
 
 	/**
+	 * Only convert atx-style headers if there's a space between the header and #
+	 * @var boolean
+	 */
+	public $hashtag_protection = false;
+
+	/**
 	 * Parser implementation
 	 */
-	
+
 	/**
 	 * Constructor function. Initialize the parser object.
 	 * @return void
 	 */
 	public function __construct() {
-		// Add extra escapable characters before parent constructor 
+		// Add extra escapable characters before parent constructor
 		// initialize the table.
 		$this->escape_chars .= ':|';
-		
-		// Insert extra document, block, and span transformations. 
+
+		// Insert extra document, block, and span transformations.
 		// Parent constructor will do the sorting.
 		$this->document_gamut += array(
 			"doFencedCodeBlocks" => 5,
@@ -103,12 +109,12 @@ class MarkdownExtra extends \Michelf\Markdown {
 			"doFootnotes"        => 5,
 			"doAbbreviations"    => 70,
 		);
-		
+
 		$this->enhanced_ordered_list = true;
 		parent::__construct();
 	}
-	
-	
+
+
 	/**
 	 * Extra variables used during extra transformations.
 	 * @var array
@@ -118,21 +124,21 @@ class MarkdownExtra extends \Michelf\Markdown {
 	protected $footnotes_ref_count = array();
 	protected $footnotes_numbers = array();
 	protected $abbr_desciptions = array();
-	/** @var @string */
+	/** @var string */
 	protected $abbr_word_re = '';
-	
+
 	/**
 	 * Give the current footnote number.
 	 * @var integer
 	 */
 	protected $footnote_counter = 1;
-	
+
 	/**
 	 * Setting up Extra-specific variables.
 	 */
 	protected function setup() {
 		parent::setup();
-		
+
 		$this->footnotes = array();
 		$this->footnotes_ordered = array();
 		$this->footnotes_ref_count = array();
@@ -140,7 +146,7 @@ class MarkdownExtra extends \Michelf\Markdown {
 		$this->abbr_desciptions = array();
 		$this->abbr_word_re = '';
 		$this->footnote_counter = 1;
-		
+
 		foreach ($this->predef_abbr as $abbr_word => $abbr_desc) {
 			if ($this->abbr_word_re)
 				$this->abbr_word_re .= '|';
@@ -159,11 +165,11 @@ class MarkdownExtra extends \Michelf\Markdown {
 		$this->footnotes_numbers = array();
 		$this->abbr_desciptions = array();
 		$this->abbr_word_re = '';
-		
+
 		parent::teardown();
 	}
-	
-	
+
+
 	/**
 	 * Extra attribute parser
 	 */
@@ -197,7 +203,7 @@ class MarkdownExtra extends \Michelf\Markdown {
 	 */
 	protected function doExtraAttributes($tag_name, $attr, $defaultIdValue = null, $classes = array()) {
 		if (empty($attr) && !$defaultIdValue && empty($classes)) return "";
-		
+
 		// Split on components
 		preg_match_all('/[#.a-z][-_:a-zA-Z0-9=]+/', $attr, $matches);
 		$elements = $matches[0];
@@ -288,38 +294,38 @@ class MarkdownExtra extends \Michelf\Markdown {
 	/**
 	 * HTML block parser
 	 */
-	
+
 	/**
 	 * Tags that are always treated as block tags
 	 * @var string
 	 */
 	protected $block_tags_re = 'p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|address|form|fieldset|iframe|hr|legend|article|section|nav|aside|hgroup|header|footer|figcaption|figure';
-						   
+
 	/**
 	 * Tags treated as block tags only if the opening tag is alone on its line
 	 * @var string
 	 */
 	protected $context_block_tags_re = 'script|noscript|style|ins|del|iframe|object|source|track|param|math|svg|canvas|audio|video';
-	
+
 	/**
 	 * Tags where markdown="1" default to span mode:
 	 * @var string
 	 */
 	protected $contain_span_tags_re = 'p|h[1-6]|li|dd|dt|td|th|legend|address';
-	
+
 	/**
 	 * Tags which must not have their contents modified, no matter where
 	 * they appear
 	 * @var string
 	 */
 	protected $clean_tags_re = 'script|style|math|svg';
-	
+
 	/**
 	 * Tags that do not need to be closed.
 	 * @var string
 	 */
 	protected $auto_close_tags_re = 'hr|img|param|source|track';
-	
+
 	/**
 	 * Hashify HTML Blocks and "clean tags".
 	 *
@@ -330,7 +336,7 @@ class MarkdownExtra extends \Michelf\Markdown {
 	 * hard-coded.
 	 *
 	 * This works by calling _HashHTMLBlocks_InMarkdown, which then calls
-	 * _HashHTMLBlocks_InHTML when it encounter block tags. When the markdown="1" 
+	 * _HashHTMLBlocks_InHTML when it encounter block tags. When the markdown="1"
 	 * attribute is found within a tag, _HashHTMLBlocks_InHTML calls back
 	 *  _HashHTMLBlocks_InMarkdown to handle the Markdown syntax within the tag.
 	 * These two functions are calling each other. It's recursive!
@@ -344,15 +350,15 @@ class MarkdownExtra extends \Michelf\Markdown {
 
 		// Call the HTML-in-Markdown hasher.
 		list($text, ) = $this->_hashHTMLBlocks_inMarkdown($text);
-		
+
 		return $text;
 	}
 
 	/**
 	 * Parse markdown text, calling _HashHTMLBlocks_InHTML for block tags.
 	 *
-	 * *   $indent is the number of space to be ignored when checking for code 
-	 *     blocks. This is important because if we don't take the indent into 
+	 * *   $indent is the number of space to be ignored when checking for code
+	 *     blocks. This is important because if we don't take the indent into
 	 *     account, something like this (which looks right) won't work as expected:
 	 *
 	 *     <div>
@@ -364,11 +370,11 @@ class MarkdownExtra extends \Michelf\Markdown {
 	 *     If you don't like this, just don't indent the tag on which
 	 *     you apply the markdown="1" attribute.
 	 *
-	 * *   If $enclosing_tag_re is not empty, stops at the first unmatched closing 
+	 * *   If $enclosing_tag_re is not empty, stops at the first unmatched closing
 	 *     tag with that name. Nested tags supported.
 	 *
-	 * *   If $span is true, text inside must treated as span. So any double 
-	 *     newline will be replaced by a single newline so that it does not create 
+	 * *   If $span is true, text inside must treated as span. So any double
+	 *     newline will be replaced by a single newline so that it does not create
 	 *     paragraphs.
 	 *
 	 * Returns an array of that form: ( processed text , remaining text )
@@ -382,18 +388,18 @@ class MarkdownExtra extends \Michelf\Markdown {
 	protected function _hashHTMLBlocks_inMarkdown($text, $indent = 0,
 										$enclosing_tag_re = '', $span = false)
 	{
-	
+
 		if ($text === '') return array('', '');
 
 		// Regex to check for the presense of newlines around a block tag.
 		$newline_before_re = '/(?:^\n?|\n\n)*$/';
-		$newline_after_re = 
+		$newline_after_re =
 			'{
 				^						# Start of text following the tag.
 				(?>[ ]*<!--.*?-->)?		# Optional comment.
 				[ ]*\n					# Must be followed by newline.
 			}xs';
-		
+
 		// Regex to match any tag.
 		$block_tag_re =
 			'{
@@ -448,7 +454,7 @@ class MarkdownExtra extends \Michelf\Markdown {
 				)
 			}xs';
 
-		
+
 		$depth = 0;		// Current depth inside the tag tree.
 		$parsed = "";	// Parsed text that will be returned.
 
@@ -457,31 +463,31 @@ class MarkdownExtra extends \Michelf\Markdown {
 		do {
 			// Split the text using the first $tag_match pattern found.
 			// Text before  pattern will be first in the array, text after
-			// pattern will be at the end, and between will be any catches made 
+			// pattern will be at the end, and between will be any catches made
 			// by the pattern.
-			$parts = preg_split($block_tag_re, $text, 2, 
+			$parts = preg_split($block_tag_re, $text, 2,
 								PREG_SPLIT_DELIM_CAPTURE);
-			
-			// If in Markdown span mode, add a empty-string span-level hash 
+
+			// If in Markdown span mode, add a empty-string span-level hash
 			// after each newline to prevent triggering any block element.
 			if ($span) {
 				$void = $this->hashPart("", ':');
 				$newline = "\n$void";
 				$parts[0] = $void . str_replace("\n", $newline, $parts[0]) . $void;
 			}
-			
+
 			$parsed .= $parts[0]; // Text before current tag.
-			
+
 			// If end of $text has been reached. Stop loop.
 			if (count($parts) < 3) {
 				$text = "";
 				break;
 			}
-			
+
 			$tag  = $parts[1]; // Tag to handle.
 			$text = $parts[2]; // Remaining text after current tag.
 			$tag_re = preg_quote($tag); // For use in a regular expression.
-			
+
 			// Check for: Fenced code block marker.
 			// Note: need to recheck the whole tag to disambiguate backtick
 			// fences from code spans
@@ -490,7 +496,7 @@ class MarkdownExtra extends \Michelf\Markdown {
 				$fence_indent = strlen($capture[1]); // use captured indent in re
 				$fence_re = $capture[2]; // use captured fence in re
 				if (preg_match('{^(?>.*\n)*?[ ]{' . ($fence_indent) . '}' . $fence_re . '[ ]*(?:\n|$)}', $text,
-					$matches)) 
+					$matches))
 				{
 					// End marker found: pass text unchanged until marker.
 					$parsed .= $tag . $matches[0];
@@ -503,7 +509,7 @@ class MarkdownExtra extends \Michelf\Markdown {
 			}
 			// Check for: Indented code block.
 			else if ($tag{0} == "\n" || $tag{0} == " ") {
-				// Indented code block: pass it unchanged, will be handled 
+				// Indented code block: pass it unchanged, will be handled
 				// later.
 				$parsed .= $tag;
 			}
@@ -525,7 +531,7 @@ class MarkdownExtra extends \Michelf\Markdown {
 				}
 			}
 			// Check for: Opening Block level tag or
-			//            Opening Context Block tag (like ins and del) 
+			//            Opening Context Block tag (like ins and del)
 			//               used as a block tag (tag is alone on it's line).
 			else if (preg_match('{^<(?:' . $this->block_tags_re . ')\b}', $tag) ||
 				(	preg_match('{^<(?:' . $this->context_block_tags_re . ')\b}', $tag) &&
@@ -534,9 +540,9 @@ class MarkdownExtra extends \Michelf\Markdown {
 				)
 			{
 				// Need to parse tag and following text using the HTML parser.
-				list($block_text, $text) = 
+				list($block_text, $text) =
 					$this->_hashHTMLBlocks_inHTML($tag . $text, "hashBlock", true);
-				
+
 				// Make sure it stays outside of any paragraph by adding newlines.
 				$parsed .= "\n\n$block_text\n\n";
 			}
@@ -547,9 +553,9 @@ class MarkdownExtra extends \Michelf\Markdown {
 			{
 				// Need to parse tag and following text using the HTML parser.
 				// (don't check for markdown attribute)
-				list($block_text, $text) = 
+				list($block_text, $text) =
 					$this->_hashHTMLBlocks_inHTML($tag . $text, "hashClean", false);
-				
+
 				$parsed .= $block_text;
 			}
 			// Check for: Tag with same name as enclosing tag.
@@ -567,14 +573,14 @@ class MarkdownExtra extends \Michelf\Markdown {
 					$text = $tag . $text;
 					break;
 				}
-				
+
 				$parsed .= $tag;
 			}
 			else {
 				$parsed .= $tag;
 			}
 		} while ($depth >= 0);
-		
+
 		return array($parsed, $text);
 	}
 
@@ -594,7 +600,7 @@ class MarkdownExtra extends \Michelf\Markdown {
 	 */
 	protected function _hashHTMLBlocks_inHTML($text, $hash_method, $md_attr) {
 		if ($text === '') return array('', '');
-		
+
 		// Regex to match `markdown` attribute inside of a tag.
 		$markdown_attr_re = '
 			{
@@ -602,15 +608,15 @@ class MarkdownExtra extends \Michelf\Markdown {
 				markdown
 				\s*=\s*
 				(?>
-					(["\'])		# $1: quote delimiter		
+					(["\'])		# $1: quote delimiter
 					(.*?)		# $2: attribute value
-					\1			# matching delimiter	
+					\1			# matching delimiter
 				|
 					([^\s>]*)	# $3: unquoted attribute value
 				)
 				()				# $4: make $3 always defined (avoid warnings)
 			}xs';
-		
+
 		// Regex to match any tag.
 		$tag_re = '{
 				(					# $2: Capture whole tag.
@@ -633,9 +639,9 @@ class MarkdownExtra extends \Michelf\Markdown {
 					<!\[CDATA\[.*?\]\]>	# CData Block
 				)
 			}xs';
-		
+
 		$original_text = $text;		// Save original text in case of faliure.
-		
+
 		$depth		= 0;	// Current depth inside the tag tree.
 		$block_text	= "";	// Temporary text holder for current text.
 		$parsed		= "";	// Parsed text that will be returned.
@@ -649,22 +655,22 @@ class MarkdownExtra extends \Michelf\Markdown {
 		do {
 			// Split the text using the first $tag_match pattern found.
 			// Text before  pattern will be first in the array, text after
-			// pattern will be at the end, and between will be any catches made 
+			// pattern will be at the end, and between will be any catches made
 			// by the pattern.
 			$parts = preg_split($tag_re, $text, 2, PREG_SPLIT_DELIM_CAPTURE);
-			
+
 			if (count($parts) < 3) {
 				// End of $text reached with unbalenced tag(s).
 				// In that case, we return original text unchanged and pass the
-				// first character as filtered to prevent an infinite loop in the 
+				// first character as filtered to prevent an infinite loop in the
 				// parent function.
 				return array($original_text{0}, substr($original_text, 1));
 			}
-			
+
 			$block_text .= $parts[0]; // Text before current tag.
 			$tag         = $parts[1]; // Tag to handle.
 			$text        = $parts[2]; // Remaining text after current tag.
-			
+
 			// Check for: Auto-close tag (like <hr/>)
 			//			 Comments and Processing Instructions.
 			if (preg_match('{^</?(?:' . $this->auto_close_tags_re . ')\b}', $tag) ||
@@ -680,20 +686,20 @@ class MarkdownExtra extends \Michelf\Markdown {
 					if ($tag{1} == '/')						$depth--;
 					else if ($tag{strlen($tag)-2} != '/')	$depth++;
 				}
-				
+
 				// Check for `markdown="1"` attribute and handle it.
-				if ($md_attr && 
+				if ($md_attr &&
 					preg_match($markdown_attr_re, $tag, $attr_m) &&
 					preg_match('/^1|block|span$/', $attr_m[2] . $attr_m[3]))
 				{
 					// Remove `markdown` attribute from opening tag.
 					$tag = preg_replace($markdown_attr_re, '', $tag);
-					
+
 					// Check if text inside this tag must be parsed in span mode.
 					$this->mode = $attr_m[2] . $attr_m[3];
 					$span_mode = $this->mode == 'span' || $this->mode != 'block' &&
 						preg_match('{^<(?:' . $this->contain_span_tags_re . ')\b}', $tag);
-					
+
 					// Calculate indent before tag.
 					if (preg_match('/(?:^|\n)( *?)(?! ).*?$/', $block_text, $matches)) {
 						$strlen = $this->utf8_strlen;
@@ -701,48 +707,48 @@ class MarkdownExtra extends \Michelf\Markdown {
 					} else {
 						$indent = 0;
 					}
-					
+
 					// End preceding block with this tag.
 					$block_text .= $tag;
 					$parsed .= $this->$hash_method($block_text);
-					
+
 					// Get enclosing tag name for the ParseMarkdown function.
 					// (This pattern makes $tag_name_re safe without quoting.)
 					preg_match('/^<([\w:$]*)\b/', $tag, $matches);
 					$tag_name_re = $matches[1];
-					
+
 					// Parse the content using the HTML-in-Markdown parser.
 					list ($block_text, $text)
-						= $this->_hashHTMLBlocks_inMarkdown($text, $indent, 
+						= $this->_hashHTMLBlocks_inMarkdown($text, $indent,
 							$tag_name_re, $span_mode);
-					
+
 					// Outdent markdown text.
 					if ($indent > 0) {
-						$block_text = preg_replace("/^[ ]{1,$indent}/m", "", 
+						$block_text = preg_replace("/^[ ]{1,$indent}/m", "",
 													$block_text);
 					}
-					
+
 					// Append tag content to parsed text.
 					if (!$span_mode)	$parsed .= "\n\n$block_text\n\n";
 					else				$parsed .= "$block_text";
-					
+
 					// Start over with a new block.
 					$block_text = "";
 				}
 				else $block_text .= $tag;
 			}
-			
+
 		} while ($depth > 0);
-		
+
 		// Hash last block text that wasn't processed inside the loop.
 		$parsed .= $this->$hash_method($block_text);
-		
+
 		return array($parsed, $text);
 	}
 
 	/**
 	 * Called whenever a tag must be hashed when a function inserts a "clean" tag
-	 * in $text, it passes through this function and is automaticaly escaped, 
+	 * in $text, it passes through this function and is automaticaly escaped,
 	 * blocking invalid nested overlap.
 	 * @param  string $text
 	 * @return string
@@ -835,7 +841,7 @@ class MarkdownExtra extends \Michelf\Markdown {
 			// for shortcut links like [this][] or [this].
 			$link_id = $link_text;
 		}
-		
+
 		// lower-case and turn embedded newlines into spaces
 		$link_id = strtolower($link_id);
 		$link_id = preg_replace('{[ ]?\n}', ' ', $link_id);
@@ -843,7 +849,7 @@ class MarkdownExtra extends \Michelf\Markdown {
 		if (isset($this->urls[$link_id])) {
 			$url = $this->urls[$link_id];
 			$url = $this->encodeURLAttribute($url);
-			
+
 			$result = "<a href=\"$url\"";
 			if ( isset( $this->titles[$link_id] ) ) {
 				$title = $this->titles[$link_id];
@@ -852,7 +858,7 @@ class MarkdownExtra extends \Michelf\Markdown {
 			}
 			if (isset($this->ref_attr[$link_id]))
 				$result .= $this->ref_attr[$link_id];
-		
+
 			$link_text = $this->runSpanGamut($link_text);
 			$result .= ">$link_text</a>";
 			$result = $this->hashPart($result);
@@ -889,7 +895,7 @@ class MarkdownExtra extends \Michelf\Markdown {
 			$result .=  " title=\"$title\"";
 		}
 		$result .= $attr;
-		
+
 		$link_text = $this->runSpanGamut($link_text);
 		$result .= ">$link_text</a>";
 
@@ -917,7 +923,7 @@ class MarkdownExtra extends \Michelf\Markdown {
 			  \]
 
 			)
-			}xs', 
+			}xs',
 			array($this, '_doImages_reference_callback'), $text);
 
 		// Next, handle inline images:  ![alt text](url "optional title")
@@ -1021,7 +1027,7 @@ class MarkdownExtra extends \Michelf\Markdown {
 		// Setext-style headers:
 		//  Header 1  {#header1}
 		//	  ========
-		//  
+		//
 		//	  Header 2  {#header2 .class1 .class2}
 		//	  --------
 		//
@@ -1042,7 +1048,7 @@ class MarkdownExtra extends \Michelf\Markdown {
 		//
 		$text = preg_replace_callback('{
 				^(\#{1,6})	# $1 = string of #\'s
-				[ ]*
+				[ ]'.($this->hashtag_protection ? '+' : '*').'
 				(.+?)		# $2 = Header text
 				[ ]*
 				\#*			# optional closing #\'s (not counted)
@@ -1107,10 +1113,10 @@ class MarkdownExtra extends \Michelf\Markdown {
 				[ ]{0,' . $less_than_tab . '}	# Allowed whitespace.
 				[|]							# Optional leading pipe (present)
 				(.+) \n						# $1: Header row (at least one pipe)
-				
+
 				[ ]{0,' . $less_than_tab . '}	# Allowed whitespace.
 				[|] ([ ]*[-:]+[-| :]*) \n	# $2: Header underline
-				
+
 				(							# $3: Cells
 					(?>
 						[ ]*				# Allowed whitespace.
@@ -1132,10 +1138,10 @@ class MarkdownExtra extends \Michelf\Markdown {
 				^							# Start of a line
 				[ ]{0,' . $less_than_tab . '}	# Allowed whitespace.
 				(\S.*[|].*) \n				# $1: Header row (at least one pipe)
-				
+
 				[ ]{0,' . $less_than_tab . '}	# Allowed whitespace.
 				([-:]+[ ]*[|][-| :]*) \n	# $2: Header underline
-				
+
 				(							# $3: Cells
 					(?>
 						.* [|] .* \n		# Row content
@@ -1159,7 +1165,7 @@ class MarkdownExtra extends \Michelf\Markdown {
 		$content	= $matches[3];
 
 		$content	= preg_replace('/^ *[|]/m', '', $content);
-		
+
 		return $this->_doTable_callback(array($matches[0], $head, $underline, $content));
 	}
 
@@ -1192,7 +1198,7 @@ class MarkdownExtra extends \Michelf\Markdown {
 		$head		= preg_replace('/[|] *$/m', '', $head);
 		$underline	= preg_replace('/[|] *$/m', '', $underline);
 		$content	= preg_replace('/[|] *$/m', '', $content);
-		
+
 		// Reading alignement from header underline.
 		$separators	= preg_split('/ *[|] */', $underline);
 		foreach ($separators as $n => $s) {
@@ -1205,14 +1211,14 @@ class MarkdownExtra extends \Michelf\Markdown {
 			else
 				$attr[$n] = '';
 		}
-		
-		// Parsing span elements, including code spans, character escapes, 
+
+		// Parsing span elements, including code spans, character escapes,
 		// and inline HTML tags, so that pipes inside those gets ignored.
 		$head		= $this->parseSpan($head);
 		$headers	= preg_split('/ *[|] */', $head);
 		$col_count	= count($headers);
 		$attr       = array_pad($attr, $col_count, '');
-		
+
 		// Write column headers.
 		$text = "<table>\n";
 		$text .= "<thead>\n";
@@ -1221,20 +1227,20 @@ class MarkdownExtra extends \Michelf\Markdown {
 			$text .= "  <th$attr[$n]>" . $this->runSpanGamut(trim($header)) . "</th>\n";
 		$text .= "</tr>\n";
 		$text .= "</thead>\n";
-		
+
 		// Split content by row.
 		$rows = explode("\n", trim($content, "\n"));
-		
+
 		$text .= "<tbody>\n";
 		foreach ($rows as $row) {
-			// Parsing span elements, including code spans, character escapes, 
+			// Parsing span elements, including code spans, character escapes,
 			// and inline HTML tags, so that pipes inside those gets ignored.
 			$row = $this->parseSpan($row);
-			
+
 			// Split row by cell.
 			$row_cells = preg_split('/ *[|] */', $row, $col_count);
 			$row_cells = array_pad($row_cells, $col_count, '');
-			
+
 			$text .= "<tr>\n";
 			foreach ($row_cells as $n => $cell)
 				$text .= "  <td$attr[$n]>" . $this->runSpanGamut(trim($cell)) . "</td>\n";
@@ -1242,7 +1248,7 @@ class MarkdownExtra extends \Michelf\Markdown {
 		}
 		$text .= "</tbody>\n";
 		$text .= "</table>";
-		
+
 		return $this->hashBlock($text) . "\n";
 	}
 
@@ -1299,7 +1305,7 @@ class MarkdownExtra extends \Michelf\Markdown {
 	protected function _doDefLists_callback($matches) {
 		// Re-usable patterns to match list item bullets and number markers:
 		$list = $matches[1];
-		
+
 		// Turn double returns into triple returns, so that we can make a
 		// paragraph for the last item in a list, if necessary:
 		$result = trim($this->processDefListItems($list));
@@ -1314,9 +1320,9 @@ class MarkdownExtra extends \Michelf\Markdown {
 	 * @return string
 	 */
 	protected function processDefListItems($list_str) {
-	
+
 		$less_than_tab = $this->tab_width - 1;
-		
+
 		// Trim trailing blank lines:
 		$list_str = preg_replace("/\n{2,}\\z/", "\n", $list_str);
 
@@ -1327,9 +1333,9 @@ class MarkdownExtra extends \Michelf\Markdown {
 				[ ]{0,' . $less_than_tab . '}	# leading whitespace
 				(?!\:[ ]|[ ])					# negative lookahead for a definition
 												#   mark (colon) or more whitespace.
-				(?> \S.* \n)+?					# actual term (not whitespace).	
-			)			
-			(?=\n?[ ]{0,3}:[ ])					# lookahead for following line feed 
+				(?> \S.* \n)+?					# actual term (not whitespace).
+			)
+			(?=\n?[ ]{0,3}:[ ])					# lookahead for following line feed
 												#   with a definition mark.
 			}xm',
 			array($this, '_processDefListItems_callback_dt'), $list_str);
@@ -1346,8 +1352,8 @@ class MarkdownExtra extends \Michelf\Markdown {
 				(?:								# next term or end of text
 					[ ]{0,' . $less_than_tab . '} \:[ ]	|
 					<dt> | \z
-				)						
-			)					
+				)
+			)
 			}xm',
 			array($this, '_processDefListItems_callback_dd'), $list_str);
 
@@ -1399,14 +1405,14 @@ class MarkdownExtra extends \Michelf\Markdown {
 	 * ~~~
 	 * Code block
 	 * ~~~
-	 * 
+	 *
 	 * @param  string $text
 	 * @return string
 	 */
 	protected function doFencedCodeBlocks($text) {
-	
+
 		$less_than_tab = $this->tab_width;
-		
+
 		$text = preg_replace_callback('{
 				(?:\n|\A)
 				# 1: Opening marker
@@ -1422,7 +1428,7 @@ class MarkdownExtra extends \Michelf\Markdown {
 					' . $this->id_class_attr_catch_re . ' # 3: Extra attributes
 				)?
 				[ ]* \n # Whitespace and newline following marker.
-				
+
 				# 4: Content
 				(
 					(?>
@@ -1430,7 +1436,7 @@ class MarkdownExtra extends \Michelf\Markdown {
 						.*\n+
 					)+
 				)
-				
+
 				# Closing marker.
 				\1 [ ]* (?= \n )
 			}xm',
@@ -1468,7 +1474,7 @@ class MarkdownExtra extends \Michelf\Markdown {
 		$pre_attr_str  = $this->code_attr_on_pre ? $attr_str : '';
 		$code_attr_str = $this->code_attr_on_pre ? '' : $attr_str;
 		$codeblock  = "<pre$pre_attr_str><code$code_attr_str>$codeblock</code></pre>";
-		
+
 		return "\n\n".$this->hashBlock($codeblock)."\n\n";
 	}
 
@@ -1478,7 +1484,7 @@ class MarkdownExtra extends \Michelf\Markdown {
 	 * @return string
 	 */
 	protected function _doFencedCodeBlocks_newlines($matches) {
-		return str_repeat("<br$this->empty_element_suffix", 
+		return str_repeat("<br$this->empty_element_suffix",
 			strlen($matches[0]));
 	}
 
@@ -1518,27 +1524,27 @@ class MarkdownExtra extends \Michelf\Markdown {
 		// Wrap <p> tags and unhashify HTML blocks
 		foreach ($grafs as $key => $value) {
 			$value = trim($this->runSpanGamut($value));
-			
+
 			// Check if this should be enclosed in a paragraph.
 			// Clean tag hashes & block tag hashes are left alone.
 			$is_p = $wrap_in_p && !preg_match('/^B\x1A[0-9]+B|^C\x1A[0-9]+C$/', $value);
-			
+
 			if ($is_p) {
 				$value = "<p>$value</p>";
 			}
 			$grafs[$key] = $value;
 		}
-		
-		// Join grafs in one text, then unhash HTML tags. 
+
+		// Join grafs in one text, then unhash HTML tags.
 		$text = implode("\n\n", $grafs);
-		
+
 		// Finish by removing any tag hashes still present in $text.
 		$text = $this->unhash($text);
-		
+
 		return $text;
 	}
-	
-	
+
+
 	/**
 	 * Footnotes - Strips link definitions from text, stores the URLs and
 	 * titles in hash references.
@@ -1554,15 +1560,15 @@ class MarkdownExtra extends \Michelf\Markdown {
 			  [ ]*
 			  \n?					# maybe *one* newline
 			(						# text = $2 (no blank lines allowed)
-				(?:					
+				(?:
 					.+				# actual text
 				|
-					\n				# newlines but 
+					\n				# newlines but
 					(?!\[.+?\][ ]?:\s)# negative lookahead for footnote or link definition marker.
-					(?!\n+[ ]{0,3}\S)# ensure line is not blank and followed 
+					(?!\n+[ ]{0,3}\S)# ensure line is not blank and followed
 									# by non-indented content
 				)*
-			)		
+			)
 			}xm',
 			array($this, '_stripFootnotes_callback'),
 			$text);
@@ -1581,7 +1587,7 @@ class MarkdownExtra extends \Michelf\Markdown {
 	}
 
 	/**
-	 * Replace footnote references in $text [^id] with a special text-token 
+	 * Replace footnote references in $text [^id] with a special text-token
 	 * which will be replaced by the actual footnote marker in appendFootnotes.
 	 * @param  string $text
 	 * @return string
@@ -1599,12 +1605,12 @@ class MarkdownExtra extends \Michelf\Markdown {
 	 * @return string
 	 */
 	protected function appendFootnotes($text) {
-		$text = preg_replace_callback('{F\x1Afn:(.*?)\x1A:}', 
+		$text = preg_replace_callback('{F\x1Afn:(.*?)\x1A:}',
 			array($this, '_appendFootnotes_callback'), $text);
-	
+
 		if (!empty($this->footnotes_ordered)) {
 			$text .= "\n\n";
-			$text .= "<div class=\"footnotes\">\n";
+			$text .= "<div class=\"footnotes\" role=\"doc-endnotes\">\n";
 			$text .= "<hr" . $this->empty_element_suffix . "\n";
 			$text .= "<ol>\n\n";
 
@@ -1618,10 +1624,12 @@ class MarkdownExtra extends \Michelf\Markdown {
 				$title = $this->fn_backlink_title;
 				$title = $this->encodeAttribute($title);
 				$attr .= " title=\"$title\"";
+				$attr .= " aria-label=\"$title\"";
 			}
+			$attr .= " role=\"doc-backlink\"";
 			$backlink_text = $this->fn_backlink_html;
 			$num = 0;
-			
+
 			while (!empty($this->footnotes_ordered)) {
 				$footnote = reset($this->footnotes_ordered);
 				$note_id = key($this->footnotes_ordered);
@@ -1629,12 +1637,12 @@ class MarkdownExtra extends \Michelf\Markdown {
 				$ref_count = $this->footnotes_ref_count[$note_id];
 				unset($this->footnotes_ref_count[$note_id]);
 				unset($this->footnotes[$note_id]);
-				
+
 				$footnote .= "\n"; // Need to append newline before parsing.
-				$footnote = $this->runBlockGamut("$footnote\n");				
-				$footnote = preg_replace_callback('{F\x1Afn:(.*?)\x1A:}', 
+				$footnote = $this->runBlockGamut("$footnote\n");
+				$footnote = preg_replace_callback('{F\x1Afn:(.*?)\x1A:}',
 					array($this, '_appendFootnotes_callback'), $footnote);
-				
+
 				$attr = str_replace("%%", ++$num, $attr);
 				$note_id = $this->encodeAttribute($note_id);
 
@@ -1649,12 +1657,12 @@ class MarkdownExtra extends \Michelf\Markdown {
 				} else {
 					$footnote .= "\n\n<p>$backlink</p>";
 				}
-				
-				$text .= "<li id=\"fn:$note_id\">\n";
+
+				$text .= "<li id=\"fn:$note_id\" role=\"doc-endnote\">\n";
 				$text .= $footnote . "\n";
 				$text .= "</li>\n\n";
 			}
-			
+
 			$text .= "</ol>\n";
 			$text .= "</div>";
 		}
@@ -1668,7 +1676,7 @@ class MarkdownExtra extends \Michelf\Markdown {
 	 */
 	protected function _appendFootnotes_callback($matches) {
 		$node_id = $this->fn_id_prefix . $matches[1];
-		
+
 		// Create footnote marker only if it has a corresponding footnote *and*
 		// the footnote hasn't been used by another marker.
 		if (isset($this->footnotes[$node_id])) {
@@ -1695,20 +1703,21 @@ class MarkdownExtra extends \Michelf\Markdown {
 				$title = $this->encodeAttribute($title);
 				$attr .= " title=\"$title\"";
 			}
-			
+			$attr .= " role=\"doc-noteref\"";
+
 			$attr = str_replace("%%", $num, $attr);
 			$node_id = $this->encodeAttribute($node_id);
-			
+
 			return
 				"<sup id=\"fnref$ref_count_mark:$node_id\">".
 				"<a href=\"#fn:$node_id\"$attr>$num</a>".
 				"</sup>";
 		}
-		
+
 		return "[^" . $matches[1] . "]";
 	}
-		
-	
+
+
 	/**
 	 * Abbreviations - strips abbreviations from text, stores titles in hash
 	 * references.
@@ -1721,7 +1730,7 @@ class MarkdownExtra extends \Michelf\Markdown {
 		// Link defs are in the form: [id]*: url "optional title"
 		$text = preg_replace_callback('{
 			^[ ]{0,' . $less_than_tab . '}\*\[(.+?)\][ ]?:	# abbr_id = $1
-			(.*)					# text = $2 (no blank lines allowed)	
+			(.*)					# text = $2 (no blank lines allowed)
 			}xm',
 			array($this, '_stripAbbreviations_callback'),
 			$text);
@@ -1751,7 +1760,7 @@ class MarkdownExtra extends \Michelf\Markdown {
 	 */
 	protected function doAbbreviations($text) {
 		if ($this->abbr_word_re) {
-			// cannot use the /x modifier because abbr_word_re may 
+			// cannot use the /x modifier because abbr_word_re may
 			// contain significant spaces:
 			$text = preg_replace_callback('{' .
 				'(?<![\w\x1A])' .
diff --git a/vendor/michelf/php-markdown/Michelf/MarkdownInterface.php b/vendor/michelf/php-markdown/Michelf/MarkdownInterface.php
index 8512e3753..7fc0da06e 100644
--- a/vendor/michelf/php-markdown/Michelf/MarkdownInterface.php
+++ b/vendor/michelf/php-markdown/Michelf/MarkdownInterface.php
@@ -4,14 +4,14 @@
  *
  * @package   php-markdown
  * @author    Michel Fortin <michel.fortin@michelf.com>
- * @copyright 2004-2016 Michel Fortin <https://michelf.com/projects/php-markdown/>
+ * @copyright 2004-2018 Michel Fortin <https://michelf.com/projects/php-markdown/>
  * @copyright (Original Markdown) 2004-2006 John Gruber <https://daringfireball.net/projects/markdown/>
  */
 
 namespace Michelf;
 
 /**
- * Markdown Parser Interface 
+ * Markdown Parser Interface
  */
 interface MarkdownInterface {
 	/**
diff --git a/vendor/michelf/php-markdown/Readme.md b/vendor/michelf/php-markdown/Readme.md
index 044407106..c05cd93d4 100644
--- a/vendor/michelf/php-markdown/Readme.md
+++ b/vendor/michelf/php-markdown/Readme.md
@@ -1,7 +1,7 @@
 PHP Markdown
 ============
 
-PHP Markdown Lib 1.7.0 - 29 Oct 2016
+PHP Markdown Lib 1.8.0 - 14 Jan 2018
 
 by Michel Fortin  
 <https://michelf.ca/>
@@ -13,16 +13,16 @@ based on Markdown by John Gruber
 Introduction
 ------------
 
-This is a library package that includes the PHP Markdown parser and its 
+This is a library package that includes the PHP Markdown parser and its
 sibling PHP Markdown Extra with additional features.
 
 Markdown is a text-to-HTML conversion tool for web writers. Markdown
 allows you to write using an easy-to-read, easy-to-write plain text
 format, then convert it to structurally valid XHTML (or HTML).
 
-"Markdown" is actually two things: a plain text markup syntax, and a 
-software tool, originally written in Perl, that converts the plain text 
-markup to HTML. PHP Markdown is a port to PHP of the original Markdown 
+"Markdown" is actually two things: a plain text markup syntax, and a
+software tool, originally written in Perl, that converts the plain text
+markup to HTML. PHP Markdown is a port to PHP of the original Markdown
 program by John Gruber.
 
 *	[Full documentation of the Markdown syntax](<https://daringfireball.net/projects/markdown/>)  
@@ -37,68 +37,77 @@ Requirement
 This library package requires PHP 5.3 or later.
 
 Note: The older plugin/library hybrid package for PHP Markdown and
-PHP Markdown Extra is still maintained and will work with PHP 4.0.5 and later.
+PHP Markdown Extra is no longer maintained but will work with PHP 4.0.5 and
+later.
 
 Before PHP 5.3.7, pcre.backtrack_limit defaults to 100 000, which is too small
-in many situations. You might need to set it to higher values. Later PHP 
+in many situations. You might need to set it to higher values. Later PHP
 releases defaults to 1 000 000, which is usually fine.
 
 
 Usage
 -----
 
-This library package is meant to be used with class autoloading. For autoloading 
-to work, your project needs have setup a PSR-0-compatible autoloader. See the 
-included Readme.php file for a minimal autoloader setup. (If you cannot use 
-autoloading, see below.)
+To use this library with Composer, first install it with:
 
-With class autoloading in place, putting the 'Michelf' folder in your 
-include path should be enough for this to work:
+	$ composer require michelf/php-markdown
 
-	use \Michelf\Markdown;
+Then include Composer's generated vendor/autoload.php to [enable autoloading]:
+
+	require 'vendor/autoload.php';
+
+Without Composer, for autoloading to work, your project needs an autoloader
+compatible with PSR-4 or PSR-0. See the included Readme.php file for a minimal
+autoloader setup. (If you cannot use autoloading, see below.)
+
+With class autoloading in place:
+
+	use Michelf\Markdown;
 	$my_html = Markdown::defaultTransform($my_text);
 
 Markdown Extra syntax is also available the same way:
 
-	use \Michelf\MarkdownExtra;
+	use Michelf\MarkdownExtra;
 	$my_html = MarkdownExtra::defaultTransform($my_text);
 
-If you wish to use PHP Markdown with another text filter function 
+If you wish to use PHP Markdown with another text filter function
 built to parse HTML, you should filter the text *after* the `transform`
-function call. This is an example with [PHP SmartyPants][psp]:
+function call. This is an example with [PHP SmartyPants]:
 
-	use \Michelf\Markdown, \Michelf\SmartyPants;
+	use Michelf\Markdown, Michelf\SmartyPants;
 	$my_html = Markdown::defaultTransform($my_text);
 	$my_html = SmartyPants::defaultTransform($my_html);
 
-All these examples are using the static `defaultTransform` static function 
-found inside the parser class. If you want to customize the parser 
-configuration, you can also instantiate it directly and change some 
+All these examples are using the static `defaultTransform` static function
+found inside the parser class. If you want to customize the parser
+configuration, you can also instantiate it directly and change some
 configuration variables:
 
-	use \Michelf\MarkdownExtra;
+	use Michelf\MarkdownExtra;
 	$parser = new MarkdownExtra;
 	$parser->fn_id_prefix = "post22-";
 	$my_html = $parser->transform($my_text);
 
 To learn more, see the full list of [configuration variables].
 
+ [enable autoloading]: https://getcomposer.org/doc/01-basic-usage.md#autoloading
+ [PHP SmartyPants]: https://michelf.ca/projects/php-smartypants/
  [configuration variables]: https://michelf.ca/projects/php-markdown/configuration/
 
 
 ### Usage without an autoloader
 
-If you cannot use class autoloading, you can still use `include` or `require` 
-to access the parser. To load the `\Michelf\Markdown` parser, do it this way:
+If you cannot use class autoloading, you can still use `include` or `require`
+to access the parser. To load the `Michelf\Markdown` parser, do it this way:
 
 	require_once 'Michelf/Markdown.inc.php';
 
-Or, if you need the `\Michelf\MarkdownExtra` parser:
+Or, if you need the `Michelf\MarkdownExtra` parser:
 
 	require_once 'Michelf/MarkdownExtra.inc.php';
 
 While the plain `.php` files depend on autoloading to work correctly, using the
-`.inc.php` files instead will eagerly load the dependencies that would be 
+`.inc.php` files instead will eagerly load the dependencies that would be
 loaded on demand if you were using autoloading.
 
 
@@ -113,19 +122,19 @@ functions and their configuration variables. The public API is stable for
 a given major version number. It might get additions when the minor version
 number increments.
 
-**Protected members are not considered public API.** This is unconventional 
-and deserves an explanation. Incrementing the major version number every time 
+**Protected members are not considered public API.** This is unconventional
+and deserves an explanation. Incrementing the major version number every time
 the underlying implementation of something changes is going to give
 nonessential version numbers for the vast majority of people who just use the
 parser.  Protected members are meant to create parser subclasses that behave in
-different ways. Very few people create parser subclasses. I don't want to 
-discourage it by making everything private, but at the same time I can't 
+different ways. Very few people create parser subclasses. I don't want to
+discourage it by making everything private, but at the same time I can't
 guarantee any stable hook between versions if you use protected members.
 
-**Syntax changes** will increment the minor number for new features, and the 
-patch number for small corrections. A *new feature* is something that needs a 
+**Syntax changes** will increment the minor number for new features, and the
+patch number for small corrections. A *new feature* is something that needs a
 change in the syntax documentation. Note that since PHP Markdown Lib includes
-two parsers, a syntax change for either of them will increment the minor 
+two parsers, a syntax change for either of them will increment the minor
 number. Also note that there is nothing perfectly backward-compatible with the
 Markdown syntax: all inputs are always valid, so new features always replace
 something that was previously legal, although generally nonsensical to do.
@@ -140,7 +149,7 @@ To file bug reports please send email to:
 Please include with your report: (1) the example input; (2) the output you
 expected; (3) the output PHP Markdown actually produced.
 
-If you have a problem where Markdown gives you an empty result, first check 
+If you have a problem where Markdown gives you an empty result, first check
 that the backtrack limit is not too low by running `php --info | grep pcre`.
 See Installation and Requirement above for details.
 
@@ -149,12 +158,12 @@ Development and Testing
 -----------------------
 
 Pull requests for fixing bugs are welcome. Proposed new features are
-going to be meticulously reviewed -- taking into account backward compatibility, 
+going to be meticulously reviewed -- taking into account backward compatibility,
 potential side effects, and future extensibility -- before deciding on
 acceptance or rejection.
 
-If you make a pull request that includes changes to the parser please add 
-tests for what is being changed to [MDTest][] and make a pull request there 
+If you make a pull request that includes changes to the parser please add
+tests for what is being changed to [MDTest][] and make a pull request there
 too.
 
  [MDTest]: https://github.com/michelf/mdtest/
@@ -163,7 +172,7 @@ too.
 Donations
 ---------
 
-If you wish to make a donation that will help me devote more time to 
+If you wish to make a donation that will help me devote more time to
 PHP Markdown, please visit [michelf.ca/donate] or send Bitcoin to
 [1HiuX34czvVPPdhXbUAsAu7pZcesniDCGH].
 
@@ -174,56 +183,72 @@ PHP Markdown, please visit [michelf.ca/donate] or send Bitcoin to
 Version History
 ---------------
 
+PHP Markdown Lib 1.8.0 (14 Jan 2018)
+
+*	Autoloading with Composer now uses PSR-4.
+
+*	HTML output for Markdown Extra footnotes now include `role` attributes
+	with values from [WAI-ARIA](https://www.w3.org/TR/dpub-aria/) to
+	make them more accessible.
+	(Thanks to Tobias Bengfort)
+
+*	In Markdown Extra, added the `hashtag_protection` configuration variable.
+	When set to `true` it prevents ATX-style headers with no space after the initial
+	hash from being interpreted as headers. This way your precious hashtags
+	are preserved.
+	(Thanks to Jaussoin Timothée for the implementation.)
+
+
 PHP Markdown Lib 1.7.0 (29 Oct 2016)
 
-*	Added a `hard_wrap` configuration variable to make all newline characters 
-	in the text become `<br>` tags in the HTML output. By default, according 
-	to the standard Markdown syntax these newlines are ignored unless they a 
+*	Added a `hard_wrap` configuration variable to make all newline characters
+	in the text become `<br>` tags in the HTML output. By default, according
+	to the standard Markdown syntax these newlines are ignored unless they a
 	preceded by two spaces. Thanks to Jonathan Cohlmeyer for the implementation.
 
-*	Improved the parsing of list items to fix problematic cases that came to 
-	light with the addition of `hard_wrap`. This should have no effect on the 
-	output except span-level list items that ended with two spaces (and thus 
+*	Improved the parsing of list items to fix problematic cases that came to
+	light with the addition of `hard_wrap`. This should have no effect on the
+	output except span-level list items that ended with two spaces (and thus
 	ended with a line break).
 
-*	Added a `code_span_content_func` configuration variable which takes a 
+*	Added a `code_span_content_func` configuration variable which takes a
 	function that will convert the content of the code span to HTML. This can
-	be useful to implement syntax highlighting. Although contrary to its 
-	code block equivalent, there is no syntax for specifying a language. 
+	be useful to implement syntax highlighting. Although contrary to its
+	code block equivalent, there is no syntax for specifying a language.
 	Credits to styxit for the implementation.
 
-*	Fixed a Markdwon Extra issue where two-space-at-end-of-line hard breaks 
-	wouldn't work inside of HTML block elements such as `<p markdown="1">` 
+*	Fixed a Markdown Extra issue where two-space-at-end-of-line hard breaks
+	wouldn't work inside of HTML block elements such as `<p markdown="1">`
 	where the element expects only span-level content.
 
-*	In the parser code, switched to PHPDoc comment format. Thanks to 
+*	In the parser code, switched to PHPDoc comment format. Thanks to
 	Robbie Averill for the help.
 
 
-PHP Markdown Lib 1.6.0 (23 Dec 2015)  
+PHP Markdown Lib 1.6.0 (23 Dec 2015)
 
-Note: this version was incorrectly released as 1.5.1 on Dec 22, a number 
+Note: this version was incorrectly released as 1.5.1 on Dec 22, a number
 that contradicted the versioning policy.
 
-*	For fenced code blocks in Markdown Extra, can now set a class name for the 
-	code block's language before the special attribute block. Previously, this 
+*	For fenced code blocks in Markdown Extra, can now set a class name for the
+	code block's language before the special attribute block. Previously, this
 	class name was only allowed in the absence of the special attribute block.
 
-*	Added a `code_block_content_func` configuration variable which takes a 
-	function that will convert the content of the code block to HTML. This is 
-	most useful for syntax highlighting. For fenced code blocks in Markdown 
-	Extra, the function has access to the language class name (the one outside 
-	of the special attribute block). Credits to Mario Konrad for providing the 
+*	Added a `code_block_content_func` configuration variable which takes a
+	function that will convert the content of the code block to HTML. This is
+	most useful for syntax highlighting. For fenced code blocks in Markdown
+	Extra, the function has access to the language class name (the one outside
+	of the special attribute block). Credits to Mario Konrad for providing the
 	implementation.
 
 *	The curled arrow character for the backlink in footnotes is now followed
 	by a Unicode variant selector to prevent it from being displayed in emoji
 	form on iOS.
 
-	Note that in older browsers the variant selector is often interpreted as a 
-	separate character, making it visible after the arrow. So there is now a 
-	also a `fn_backlink_html` configuration variable that can be used to set 
-	the link text to something else. Credits to Dana for providing the 
+	Note that in older browsers the variant selector is often interpreted as a
+	separate character, making it visible after the arrow. So there is now a
+	also a `fn_backlink_html` configuration variable that can be used to set
+	the link text to something else. Credits to Dana for providing the
 	implementation.
 
 *	Fixed an issue in MarkdownExtra where long header lines followed by a
@@ -235,13 +260,13 @@ PHP Markdown Lib 1.5.0 (1 Mar 2015)
 
 *	Added the ability start ordered lists with a number different from 1 and
 	and have that reflected in the HTML output. This can be enabled with
-	the `enhanced_ordered_lists` configuration variable for the Markdown 
+	the `enhanced_ordered_lists` configuration variable for the Markdown
 	parser; it is enabled by default for Markdown Extra.
 	Credits to Matt Gorle for providing the implementation.
 
-*	Added the ability to insert custom HTML attributes with simple values 
+*	Added the ability to insert custom HTML attributes with simple values
 	everywhere an extra attribute block is allowed (links, images, headers).
-	The value must be unquoted, cannot contains spaces and is limited to 
+	The value must be unquoted, cannot contains spaces and is limited to
 	alphanumeric ASCII characters.
 	Credits to Peter Droogmans for providing the implementation.
 
@@ -256,7 +281,7 @@ PHP Markdown Lib 1.5.0 (1 Mar 2015)
 PHP Markdown Lib 1.4.1 (4 May 2014)
 
 *	The HTML block parser will now treat `<figure>` as a block-level element
-	(as it should) and no longer wrap it in `<p>` or parse it's content with 
+	(as it should) and no longer wrap it in `<p>` or parse it's content with
 	the as Markdown syntax (although with Extra you can use `markdown="1"`
 	if you wish to use the Markdown syntax inside it).
 
@@ -265,7 +290,7 @@ PHP Markdown Lib 1.4.1 (4 May 2014)
 
 *	Corrected an bug where some inline links with spaces in them would not
 	work even when surounded with angle brackets:
-	
+
 		[link](<s p a c e s>)
 
 *	Fixed an issue where email addresses with quotes in them would not always
@@ -281,9 +306,9 @@ PHP Markdown Lib 1.4.0 (29 Nov 2013)
 *	Added support for the `tel:` URL scheme in automatic links.
 
 		<tel:+1-111-111-1111>
-	
+
 	It gets converted to this (note the `tel:` prefix becomes invisible):
-	
+
 		<a href="tel:+1-111-111-1111">+1-111-111-1111</a>
 
 *	Added backtick fenced code blocks to MarkdownExtra, originally from
@@ -294,16 +319,16 @@ PHP Markdown Lib 1.4.0 (29 Nov 2013)
 	you want to create a mockup parser object for unit testing.
 
 *	For those of you who cannot use class autoloading, you can now
-	include `Michelf/Markdown.inc.php` or `Michelf/MarkdownExtra.inc.php` (note 
+	include `Michelf/Markdown.inc.php` or `Michelf/MarkdownExtra.inc.php` (note
 	the 	`.inc.php` extension) to automatically include other files required
 	by the parser.
 
 
 PHP Markdown Lib 1.3 (11 Apr 2013)
 
-This is the first release of PHP Markdown Lib. This package requires PHP 
-version 5.3 or later and is designed to work with PSR-0 autoloading and, 
-optionally with Composer. Here is a list of the changes since 
+This is the first release of PHP Markdown Lib. This package requires PHP
+version 5.3 or later and is designed to work with PSR-0 autoloading and,
+optionally with Composer. Here is a list of the changes since
 PHP Markdown Extra 1.2.6:
 
 *	Plugin interface for WordPress and other systems is no longer present in
@@ -323,22 +348,22 @@ PHP Markdown Extra 1.2.6:
 *	Added optional class and id attributes to images and links using the same
 	syntax as for headers:
 
-		[link](url){#id .class}  
+		[link](url){#id .class}
 		![img](url){#id .class}
-	
+
 	It work too for reference-style links and images. In this case you need
 	to put those attributes at the reference definition:
 
-		[link][linkref] or [linkref]  
+		[link][linkref] or [linkref]
 		![img][linkref]
-		
+
 		[linkref]: url "optional title" {#id .class}
 
-*	Fixed a PHP notice message triggered when some table column separator 
+*	Fixed a PHP notice message triggered when some table column separator
 	markers are missing on the separator line below column headers.
 
 *	Fixed a small mistake that could cause the parser to retain an invalid
-	state related to parsing links across multiple runs. This was never 
+	state related to parsing links across multiple runs. This was never
 	observed (that I know of), but it's still worth fixing.
 
 
@@ -351,20 +376,20 @@ Copyright (c) 2004-2016 Michel Fortin
 All rights reserved.
 
 Based on Markdown  
-Copyright (c) 2003-2005 John Gruber   
-<https://daringfireball.net/>   
+Copyright (c) 2003-2005 John Gruber  
+<https://daringfireball.net/>  
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are
 met:
 
-*   Redistributions of source code must retain the above copyright 
+*   Redistributions of source code must retain the above copyright
     notice, this list of conditions and the following disclaimer.
 
 *   Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions and the following disclaimer in the
-    documentation and/or other materials provided with the 
+    documentation and/or other materials provided with the
     distribution.
 
 *   Neither the name "Markdown" nor the names of its contributors may
diff --git a/vendor/michelf/php-markdown/Readme.php b/vendor/michelf/php-markdown/Readme.php
index 89449dea4..e473d7336 100644
--- a/vendor/michelf/php-markdown/Readme.php
+++ b/vendor/michelf/php-markdown/Readme.php
@@ -4,13 +4,15 @@
 // through the Markdown filter. You can adapt this sample code in any way
 // you like.
 
-// Install PSR-0-compatible class autoloader
+// Install PSR-4-compatible class autoloader
 spl_autoload_register(function($class){
-	require preg_replace('{\\\\|_(?!.*\\\\)}', DIRECTORY_SEPARATOR, ltrim($class, '\\')).'.php';
+	require str_replace('\\', DIRECTORY_SEPARATOR, ltrim($class, '\\')).'.php';
 });
+// If using Composer, use this instead:
+//require 'vendor/autoloader.php';
 
 // Get Markdown class
-use \Michelf\Markdown;
+use Michelf\Markdown;
 
 // Read file and pass content through the Markdown parser
 $text = file_get_contents('Readme.md');
diff --git a/vendor/michelf/php-markdown/composer.json b/vendor/michelf/php-markdown/composer.json
index 36a4f744a..6b1993d65 100644
--- a/vendor/michelf/php-markdown/composer.json
+++ b/vendor/michelf/php-markdown/composer.json
@@ -21,11 +21,6 @@
 		"php": ">=5.3.0"
 	},
 	"autoload": {
- 		"psr-0": { "Michelf": "" }
-	},
-	"extra": {
-		"branch-alias": {
-			"dev-lib": "1.4.x-dev"
-		}
+ 		"psr-4": { "Michelf\\": "Michelf/" }
 	}
 }