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diff --git a/vendor/sabre/xml/lib/Service.php b/vendor/sabre/xml/lib/Service.php
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+++ b/vendor/sabre/xml/lib/Service.php
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+<?php
+
+namespace Sabre\Xml;
+
+/**
+ * XML parsing and writing service.
+ *
+ * You are encouraged to make a instance of this for your application and
+ * potentially extend it, as a central API point for dealing with xml and
+ * configuring the reader and writer.
+ *
+ * @copyright Copyright (C) 2009-2015 fruux GmbH (https://fruux.com/).
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class Service {
+
+    /**
+     * This is the element map. It contains a list of XML elements (in clark
+     * notation) as keys and PHP class names as values.
+     *
+     * The PHP class names must implement Sabre\Xml\Element.
+     *
+     * Values may also be a callable. In that case the function will be called
+     * directly.
+     *
+     * @var array
+     */
+    public $elementMap = [];
+
+    /**
+     * This is a list of namespaces that you want to give default prefixes.
+     *
+     * You must make sure you create this entire list before starting to write.
+     * They should be registered on the root element.
+     *
+     * @var array
+     */
+    public $namespaceMap = [];
+
+    /**
+     * This is a list of custom serializers for specific classes.
+     *
+     * The writer may use this if you attempt to serialize an object with a
+     * class that does not implement XmlSerializable.
+     *
+     * Instead it will look at this classmap to see if there is a custom
+     * serializer here. This is useful if you don't want your value objects
+     * to be responsible for serializing themselves.
+     *
+     * The keys in this classmap need to be fully qualified PHP class names,
+     * the values must be callbacks. The callbacks take two arguments. The
+     * writer class, and the value that must be written.
+     *
+     * function (Writer $writer, object $value)
+     *
+     * @var array
+     */
+    public $classMap = [];
+
+    /**
+     * Returns a fresh XML Reader
+     *
+     * @return Reader
+     */
+    function getReader() {
+
+        $r = new Reader();
+        $r->elementMap = $this->elementMap;
+        return $r;
+
+    }
+
+    /**
+     * Returns a fresh xml writer
+     *
+     * @return Writer
+     */
+    function getWriter() {
+
+        $w = new Writer();
+        $w->namespaceMap = $this->namespaceMap;
+        $w->classMap = $this->classMap;
+        return $w;
+
+    }
+
+    /**
+     * Parses a document in full.
+     *
+     * Input may be specified as a string or readable stream resource.
+     * The returned value is the value of the root document.
+     *
+     * Specifying the $contextUri allows the parser to figure out what the URI
+     * of the document was. This allows relative URIs within the document to be
+     * expanded easily.
+     *
+     * The $rootElementName is specified by reference and will be populated
+     * with the root element name of the document.
+     *
+     * @param string|resource $input
+     * @param string|null $contextUri
+     * @param string|null $rootElementName
+     * @throws ParseException
+     * @return array|object|string
+     */
+    function parse($input, $contextUri = null, &$rootElementName = null) {
+
+        if (is_resource($input)) {
+            // Unfortunately the XMLReader doesn't support streams. When it
+            // does, we can optimize this.
+            $input = stream_get_contents($input);
+        }
+        $r = $this->getReader();
+        $r->contextUri = $contextUri;
+        $r->xml($input);
+
+        $result = $r->parse();
+        $rootElementName = $result['name'];
+        return $result['value'];
+
+    }
+
+    /**
+     * Parses a document in full, and specify what the expected root element
+     * name is.
+     *
+     * This function works similar to parse, but the difference is that the
+     * user can specify what the expected name of the root element should be,
+     * in clark notation.
+     *
+     * This is useful in cases where you expected a specific document to be
+     * passed, and reduces the amount of if statements.
+     *
+     * It's also possible to pass an array of expected rootElements if your
+     * code may expect more than one document type.
+     *
+     * @param string|string[] $rootElementName
+     * @param string|resource $input
+     * @param string|null $contextUri
+     * @return void
+     */
+    function expect($rootElementName, $input, $contextUri = null) {
+
+        if (is_resource($input)) {
+            // Unfortunately the XMLReader doesn't support streams. When it
+            // does, we can optimize this.
+            $input = stream_get_contents($input);
+        }
+        $r = $this->getReader();
+        $r->contextUri = $contextUri;
+        $r->xml($input);
+
+        $result = $r->parse();
+        if (!in_array($result['name'], (array)$rootElementName, true)) {
+            throw new ParseException('Expected ' . implode(' or ', (array)$rootElementName) . ' but received ' . $result['name'] . ' as the root element');
+        }
+        return $result['value'];
+
+    }
+
+    /**
+     * Generates an XML document in one go.
+     *
+     * The $rootElement must be specified in clark notation.
+     * The value must be a string, an array or an object implementing
+     * XmlSerializable. Basically, anything that's supported by the Writer
+     * object.
+     *
+     * $contextUri can be used to specify a sort of 'root' of the PHP application,
+     * in case the xml document is used as a http response.
+     *
+     * This allows an implementor to easily create URI's relative to the root
+     * of the domain.
+     *
+     * @param string $rootElementName
+     * @param string|array|XmlSerializable $value
+     * @param string|null $contextUri
+     */
+    function write($rootElementName, $value, $contextUri = null) {
+
+        $w = $this->getWriter();
+        $w->openMemory();
+        $w->contextUri = $contextUri;
+        $w->setIndent(true);
+        $w->startDocument();
+        $w->writeElement($rootElementName, $value);
+        return $w->outputMemory();
+
+    }
+
+    /**
+     * Map an xml element to a PHP class.
+     *
+     * Calling this function will automatically setup the Reader and Writer
+     * classes to turn a specific XML element to a PHP class.
+     *
+     * For example, given a class such as :
+     *
+     * class Author {
+     *   public $firstName;
+     *   public $lastName;
+     * }
+     *
+     * and an XML element such as:
+     *
+     * <author xmlns="http://example.org/ns">
+     *   <firstName>...</firstName>
+     *   <lastName>...</lastName>
+     * </author>
+     *
+     * These can easily be mapped by calling:
+     *
+     * $service->mapValueObject('{http://example.org}author', 'Author');
+     *
+     * @param string $elementName
+     * @param object $className
+     * @return void
+     */
+    function mapValueObject($elementName, $className) {
+        list($namespace) = self::parseClarkNotation($elementName);
+
+        $this->elementMap[$elementName] = function(Reader $reader) use ($className, $namespace) {
+            return \Sabre\Xml\Deserializer\valueObject($reader, $className, $namespace);
+        };
+        $this->classMap[$className] = function(Writer $writer, $valueObject) use ($namespace) {
+            return \Sabre\Xml\Serializer\valueObject($writer, $valueObject, $namespace);
+        };
+        $this->valueObjectMap[$className] = $elementName;
+    }
+
+    /**
+     * Writes a value object.
+     *
+     * This function largely behaves similar to write(), except that it's
+     * intended specifically to serialize a Value Object into an XML document.
+     *
+     * The ValueObject must have been previously registered using
+     * mapValueObject().
+     *
+     * @param object $object
+     * @param string $contextUri
+     * @return void
+     */
+    function writeValueObject($object, $contextUri = null) {
+
+        if (!isset($this->valueObjectMap[get_class($object)])) {
+            throw new \InvalidArgumentException('"' . get_class($object) . '" is not a registered value object class. Register your class with mapValueObject.');
+        }
+        return $this->write(
+            $this->valueObjectMap[get_class($object)],
+            $object,
+            $contextUri
+        );
+
+    }
+
+    /**
+     * Parses a clark-notation string, and returns the namespace and element
+     * name components.
+     *
+     * If the string was invalid, it will throw an InvalidArgumentException.
+     *
+     * @param string $str
+     * @throws InvalidArgumentException
+     * @return array
+     */
+    static function parseClarkNotation($str) {
+        static $cache = [];
+
+        if (!isset($cache[$str])) {
+
+            if (!preg_match('/^{([^}]*)}(.*)$/', $str, $matches)) {
+                throw new \InvalidArgumentException('\'' . $str . '\' is not a valid clark-notation formatted string');
+            }
+
+            $cache[$str] = [
+                $matches[1],
+                $matches[2]
+            ];
+        }
+
+        return $cache[$str];
+    }
+
+    /**
+     * A list of classes and which XML elements they map to.
+     */
+    protected $valueObjectMap = [];
+
+}