[FEATURE] Add config and use composer autoloader.

We use composer already to install SabreDAV. Include config
composer.(json|lock) to install and manage more dependencies
in future.
Also provide PSR-4 autoloading for our namespaced classes, e.g.
"Zotlabs\". To regenerate autoloader maps use:
$ composer install --optimize-autoloader --no-dev

We could also remove the whole vendor/ folder from our repository, but
that would need changes in deployment and how to install hubs and needs
more discussion first.

7 files changed, 138 insertions, 69 deletions

diff --git a/vendor/sabre/xml/.travis.yml b/vendor/sabre/xml/.travis.yml
index 9bba4d451..96396564e 100644
--- a/vendor/sabre/xml/.travis.yml
+++ b/vendor/sabre/xml/.travis.yml
@@ -1,11 +1,9 @@
 language: php
 php:
-  - 5.4
   - 5.5
   - 5.6
-  - 7
-  - nightly
-  - hhvm
+  - 7.0
+  - 7.1
 
 matrix:
   fast_finish: true
@@ -16,10 +14,13 @@ cache:
   directories:
     - $HOME/.composer/cache
 
+before_install:
+  - phpenv config-rm xdebug.ini; true
+
+install:
+  - composer install
+
 script:
   - ./bin/phpunit --configuration tests/phpunit.xml.dist
   - ./bin/sabre-cs-fixer fix . --dry-run --diff
 
-before_script:
-  - phpenv config-rm xdebug.ini; true
-  - composer install
diff --git a/vendor/sabre/xml/CHANGELOG.md b/vendor/sabre/xml/CHANGELOG.md
index a8085401b..39a39bffe 100644
--- a/vendor/sabre/xml/CHANGELOG.md
+++ b/vendor/sabre/xml/CHANGELOG.md
@@ -1,7 +1,16 @@
 ChangeLog
 =========
 
-1.4.2 (????-??-??)
+1.5.0 (2016-10-09)
+------------------
+
+* Now requires PHP 5.5.
+* Using `finally` to always roll back the context stack when serializing.
+* #94: Fixed an infinite loop condition when reading some invalid XML
+  documents.
+
+
+1.4.2 (2016-05-19)
 ------------------
 
 * The `contextStack` in the Reader object is now correctly rolled back in
diff --git a/vendor/sabre/xml/composer.json b/vendor/sabre/xml/composer.json
new file mode 100644
index 000000000..386f8213f
--- /dev/null
+++ b/vendor/sabre/xml/composer.json
@@ -0,0 +1,53 @@
+{
+    "name": "sabre/xml",
+    "description" : "sabre/xml is an XML library that you may not hate.",
+    "keywords" : [ "XML", "XMLReader", "XMLWriter", "DOM" ],
+    "homepage" : "https://sabre.io/xml/",
+    "license" : "BSD-3-Clause",
+    "require" : {
+        "php" : ">=5.5.5",
+        "ext-xmlwriter" : "*",
+        "ext-xmlreader" : "*",
+        "ext-dom" : "*",
+        "lib-libxml" : ">=2.6.20",
+        "sabre/uri" : ">=1.0,<3.0.0"
+    },
+    "authors" : [
+        {
+            "name" : "Evert Pot",
+            "email" : "me@evertpot.com",
+            "homepage" : "http://evertpot.com/",
+            "role" : "Developer"
+        },
+        {
+            "name": "Markus Staab",
+            "email": "markus.staab@redaxo.de",
+            "role" : "Developer"
+        }
+    ],
+    "support" : {
+        "forum" : "https://groups.google.com/group/sabredav-discuss",
+        "source" : "https://github.com/fruux/sabre-xml"
+    },
+    "autoload" : {
+        "psr-4" : {
+            "Sabre\\Xml\\" : "lib/"
+        },
+        "files": [
+            "lib/Deserializer/functions.php",
+            "lib/Serializer/functions.php"
+        ]
+    },
+    "autoload-dev" : {
+        "psr-4" : {
+            "Sabre\\Xml\\" : "tests/Sabre/Xml/"
+        }
+    },
+    "require-dev": {
+        "sabre/cs": "~1.0.0",
+        "phpunit/phpunit" : "*"
+    },
+    "config" : {
+        "bin-dir" : "bin/"
+    }
+}
diff --git a/vendor/sabre/xml/lib/Element/XmlFragment.php b/vendor/sabre/xml/lib/Element/XmlFragment.php
index 0abfac132..642241ca4 100644
--- a/vendor/sabre/xml/lib/Element/XmlFragment.php
+++ b/vendor/sabre/xml/lib/Element/XmlFragment.php
@@ -2,9 +2,9 @@
 
 namespace Sabre\Xml\Element;
 
+use Sabre\Xml\Element;
 use Sabre\Xml\Reader;
 use Sabre\Xml\Writer;
-use Sabre\Xml\Element;
 
 /**
  * The XmlFragment element allows you to extract a portion of your xml tree,
diff --git a/vendor/sabre/xml/lib/Reader.php b/vendor/sabre/xml/lib/Reader.php
index f35dc8537..92e5dba96 100644
--- a/vendor/sabre/xml/lib/Reader.php
+++ b/vendor/sabre/xml/lib/Reader.php
@@ -59,22 +59,26 @@ class Reader extends XMLReader {
         $previousEntityState = libxml_disable_entity_loader(true);
         $previousSetting = libxml_use_internal_errors(true);
 
-        // Really sorry about the silence operator, seems like I have no
-        // choice. See:
-        //
-        // https://bugs.php.net/bug.php?id=64230
-        while ($this->nodeType !== self::ELEMENT && @$this->read()) {
-            // noop
-        }
-        $result = $this->parseCurrentElement();
+        try {
+
+            // Really sorry about the silence operator, seems like I have no
+            // choice. See:
+            //
+            // https://bugs.php.net/bug.php?id=64230
+            while ($this->nodeType !== self::ELEMENT && @$this->read()) {
+                // noop
+            }
+            $result = $this->parseCurrentElement();
 
-        $errors = libxml_get_errors();
-        libxml_clear_errors();
-        libxml_use_internal_errors($previousSetting);
-        libxml_disable_entity_loader($previousEntityState);
+            $errors = libxml_get_errors();
+            libxml_clear_errors();
+            if ($errors) {
+                throw new LibXMLException($errors);
+            }
 
-        if ($errors) {
-            throw new LibXMLException($errors);
+        } finally {
+            libxml_use_internal_errors($previousSetting);
+            libxml_disable_entity_loader($previousEntityState);
         }
 
         return $result;
@@ -138,60 +142,62 @@ class Reader extends XMLReader {
             $this->elementMap = $elementMap;
         }
 
-        // Really sorry about the silence operator, seems like I have no
-        // choice. See:
-        //
-        // https://bugs.php.net/bug.php?id=64230
-        if (!@$this->read()) {
-            if (!is_null($elementMap)) {
-                $this->popContext();
-            }
-            return false;
-        }
-
-        while (true) {
-
-            if (!$this->isValid()) {
+        try {
 
+            // Really sorry about the silence operator, seems like I have no
+            // choice. See:
+            //
+            // https://bugs.php.net/bug.php?id=64230
+            if (!@$this->read()) {
                 $errors = libxml_get_errors();
-
+                libxml_clear_errors();
                 if ($errors) {
-                    libxml_clear_errors();
-                    if (!is_null($elementMap)) {
-                        $this->popContext();
-                    }
                     throw new LibXMLException($errors);
                 }
+                throw new ParseException('This should never happen (famous last words)');
             }
 
-            switch ($this->nodeType) {
-                case self::ELEMENT :
-                    $elements[] = $this->parseCurrentElement();
-                    break;
-                case self::TEXT :
-                case self::CDATA :
-                    $text .= $this->value;
-                    $this->read();
-                    break;
-                case self::END_ELEMENT :
-                    // Ensuring we are moving the cursor after the end element.
-                    $this->read();
-                    break 2;
-                case self::NONE :
-                    if (!is_null($elementMap)) {
-                        $this->popContext();
+            while (true) {
+
+                if (!$this->isValid()) {
+
+                    $errors = libxml_get_errors();
+
+                    if ($errors) {
+                        libxml_clear_errors();
+                        throw new LibXMLException($errors);
                     }
-                    throw new ParseException('We hit the end of the document prematurely. This likely means that some parser "eats" too many elements. Do not attempt to continue parsing.');
-                default :
-                    // Advance to the next element
-                    $this->read();
-                    break;
+                }
+
+                switch ($this->nodeType) {
+                    case self::ELEMENT :
+                        $elements[] = $this->parseCurrentElement();
+                        break;
+                    case self::TEXT :
+                    case self::CDATA :
+                        $text .= $this->value;
+                        $this->read();
+                        break;
+                    case self::END_ELEMENT :
+                        // Ensuring we are moving the cursor after the end element.
+                        $this->read();
+                        break 2;
+                    case self::NONE :
+                        throw new ParseException('We hit the end of the document prematurely. This likely means that some parser "eats" too many elements. Do not attempt to continue parsing.');
+                    default :
+                        // Advance to the next element
+                        $this->read();
+                        break;
+                }
+
             }
 
-        }
+        } finally {
+
+            if (!is_null($elementMap)) {
+                $this->popContext();
+            }
 
-        if (!is_null($elementMap)) {
-            $this->popContext();
         }
         return ($elements ? $elements : $text);
 
@@ -304,7 +310,7 @@ class Reader extends XMLReader {
 
         $deserializer = $this->elementMap[$name];
         if (is_subclass_of($deserializer, 'Sabre\\Xml\\XmlDeserializable')) {
-            return [ $deserializer, 'xmlDeserialize' ];
+            return [$deserializer, 'xmlDeserialize'];
         }
 
         if (is_callable($deserializer)) {
diff --git a/vendor/sabre/xml/lib/Version.php b/vendor/sabre/xml/lib/Version.php
index f199e7158..7edb40d67 100644
--- a/vendor/sabre/xml/lib/Version.php
+++ b/vendor/sabre/xml/lib/Version.php
@@ -14,6 +14,6 @@ class Version {
     /**
      * Full version number
      */
-    const VERSION = '1.4.1';
+    const VERSION = '1.5.0';
 
 }
diff --git a/vendor/sabre/xml/lib/Writer.php b/vendor/sabre/xml/lib/Writer.php
index adfbe0cb0..09d4cb321 100644
--- a/vendor/sabre/xml/lib/Writer.php
+++ b/vendor/sabre/xml/lib/Writer.php
@@ -127,7 +127,7 @@ class Writer extends XMLWriter {
 
             if (array_key_exists($namespace, $this->namespaceMap)) {
                 $result = $this->startElementNS(
-                    $this->namespaceMap[$namespace] === '' ?  null : $this->namespaceMap[$namespace],
+                    $this->namespaceMap[$namespace] === '' ? null : $this->namespaceMap[$namespace],
                     $localName,
                     null
                 );