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diff --git a/vendor/zendframework/zend-feed/src/Writer/ExtensionPluginManager.php b/vendor/zendframework/zend-feed/src/Writer/ExtensionPluginManager.php
new file mode 100644
index 000000000..c5bd2fb01
--- /dev/null
+++ b/vendor/zendframework/zend-feed/src/Writer/ExtensionPluginManager.php
@@ -0,0 +1,180 @@
+<?php
+/**
+ * Zend Framework (http://framework.zend.com/)
+ *
+ * @link      http://github.com/zendframework/zf2 for the canonical source repository
+ * @copyright Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
+ * @license   http://framework.zend.com/license/new-bsd New BSD License
+ */
+
+namespace Zend\Feed\Writer;
+
+use Zend\ServiceManager\AbstractPluginManager;
+use Zend\ServiceManager\Exception\InvalidServiceException;
+use Zend\ServiceManager\Factory\InvokableFactory;
+
+/**
+ * Plugin manager implementation for feed writer extensions
+ *
+ * Validation checks that we have an Entry, Feed, or Extension\AbstractRenderer.
+ */
+class ExtensionPluginManager extends AbstractPluginManager implements ExtensionManagerInterface
+{
+    /**
+     * Aliases for default set of extension classes
+     *
+     * @var array
+     */
+    protected $aliases = [
+        'atomrendererfeed'           => Extension\Atom\Renderer\Feed::class,
+        'atomRendererFeed'           => Extension\Atom\Renderer\Feed::class,
+        'AtomRendererFeed'           => Extension\Atom\Renderer\Feed::class,
+        'AtomRenderer\Feed'          => Extension\Atom\Renderer\Feed::class,
+        'contentrendererentry'       => Extension\Content\Renderer\Entry::class,
+        'contentRendererEntry'       => Extension\Content\Renderer\Entry::class,
+        'ContentRendererEntry'       => Extension\Content\Renderer\Entry::class,
+        'ContentRenderer\Entry'      => Extension\Content\Renderer\Entry::class,
+        'dublincorerendererentry'    => Extension\DublinCore\Renderer\Entry::class,
+        'dublinCoreRendererEntry'    => Extension\DublinCore\Renderer\Entry::class,
+        'DublinCoreRendererEntry'    => Extension\DublinCore\Renderer\Entry::class,
+        'DublinCoreRenderer\Entry'   => Extension\DublinCore\Renderer\Entry::class,
+        'dublincorerendererfeed'     => Extension\DublinCore\Renderer\Feed::class,
+        'dublinCoreRendererFeed'     => Extension\DublinCore\Renderer\Feed::class,
+        'DublinCoreRendererFeed'     => Extension\DublinCore\Renderer\Feed::class,
+        'DublinCoreRenderer\Feed'    => Extension\DublinCore\Renderer\Feed::class,
+        'itunesentry'                => Extension\ITunes\Entry::class,
+        'itunesEntry'                => Extension\ITunes\Entry::class,
+        'iTunesEntry'                => Extension\ITunes\Entry::class,
+        'ItunesEntry'                => Extension\ITunes\Entry::class,
+        'Itunes\Entry'               => Extension\ITunes\Entry::class,
+        'itunesfeed'                 => Extension\ITunes\Feed::class,
+        'itunesFeed'                 => Extension\ITunes\Feed::class,
+        'iTunesFeed'                 => Extension\ITunes\Feed::class,
+        'ItunesFeed'                 => Extension\ITunes\Feed::class,
+        'Itunes\Feed'                => Extension\ITunes\Feed::class,
+        'itunesrendererentry'        => Extension\ITunes\Renderer\Entry::class,
+        'itunesRendererEntry'        => Extension\ITunes\Renderer\Entry::class,
+        'iTunesRendererEntry'        => Extension\ITunes\Renderer\Entry::class,
+        'ItunesRendererEntry'        => Extension\ITunes\Renderer\Entry::class,
+        'ItunesRenderer\Entry'       => Extension\ITunes\Renderer\Entry::class,
+        'itunesrendererfeed'         => Extension\ITunes\Renderer\Feed::class,
+        'itunesRendererFeed'         => Extension\ITunes\Renderer\Feed::class,
+        'iTunesRendererFeed'         => Extension\ITunes\Renderer\Feed::class,
+        'ItunesRendererFeed'         => Extension\ITunes\Renderer\Feed::class,
+        'ItunesRenderer\Feed'        => Extension\ITunes\Renderer\Feed::class,
+        'slashrendererentry'         => Extension\Slash\Renderer\Entry::class,
+        'slashRendererEntry'         => Extension\Slash\Renderer\Entry::class,
+        'SlashRendererEntry'         => Extension\Slash\Renderer\Entry::class,
+        'SlashRenderer\Entry'        => Extension\Slash\Renderer\Entry::class,
+        'threadingrendererentry'     => Extension\Threading\Renderer\Entry::class,
+        'threadingRendererEntry'     => Extension\Threading\Renderer\Entry::class,
+        'ThreadingRendererEntry'     => Extension\Threading\Renderer\Entry::class,
+        'ThreadingRenderer\Entry'    => Extension\Threading\Renderer\Entry::class,
+        'wellformedwebrendererentry' => Extension\WellFormedWeb\Renderer\Entry::class,
+        'wellFormedWebRendererEntry' => Extension\WellFormedWeb\Renderer\Entry::class,
+        'WellFormedWebRendererEntry' => Extension\WellFormedWeb\Renderer\Entry::class,
+        'WellFormedWebRenderer\Entry' => Extension\WellFormedWeb\Renderer\Entry::class,
+    ];
+
+    /**
+     * Factories for default set of extension classes
+     *
+     * @var array
+     */
+    protected $factories = [
+        Extension\Atom\Renderer\Feed::class           => InvokableFactory::class,
+        Extension\Content\Renderer\Entry::class       => InvokableFactory::class,
+        Extension\DublinCore\Renderer\Entry::class    => InvokableFactory::class,
+        Extension\DublinCore\Renderer\Feed::class     => InvokableFactory::class,
+        Extension\ITunes\Entry::class                 => InvokableFactory::class,
+        Extension\ITunes\Feed::class                  => InvokableFactory::class,
+        Extension\ITunes\Renderer\Entry::class        => InvokableFactory::class,
+        Extension\ITunes\Renderer\Feed::class         => InvokableFactory::class,
+        Extension\Slash\Renderer\Entry::class         => InvokableFactory::class,
+        Extension\Threading\Renderer\Entry::class     => InvokableFactory::class,
+        Extension\WellFormedWeb\Renderer\Entry::class => InvokableFactory::class,
+        // Legacy (v2) due to alias resolution; canonical form of resolved
+        // alias is used to look up the factory, while the non-normalized
+        // resolved alias is used as the requested name passed to the factory.
+        'zendfeedwriterextensionatomrendererfeed'           => InvokableFactory::class,
+        'zendfeedwriterextensioncontentrendererentry'       => InvokableFactory::class,
+        'zendfeedwriterextensiondublincorerendererentry'    => InvokableFactory::class,
+        'zendfeedwriterextensiondublincorerendererfeed'     => InvokableFactory::class,
+        'zendfeedwriterextensionitunesentry'                => InvokableFactory::class,
+        'zendfeedwriterextensionitunesfeed'                 => InvokableFactory::class,
+        'zendfeedwriterextensionitunesrendererentry'        => InvokableFactory::class,
+        'zendfeedwriterextensionitunesrendererfeed'         => InvokableFactory::class,
+        'zendfeedwriterextensionslashrendererentry'         => InvokableFactory::class,
+        'zendfeedwriterextensionthreadingrendererentry'     => InvokableFactory::class,
+        'zendfeedwriterextensionwellformedwebrendererentry' => InvokableFactory::class,
+    ];
+
+    /**
+     * Do not share instances (v2)
+     *
+     * @var bool
+     */
+    protected $shareByDefault = false;
+
+    /**
+     * Do not share instances (v3)
+     *
+     * @var bool
+     */
+    protected $sharedByDefault = false;
+
+    /**
+     * Validate the plugin (v3)
+     *
+     * Checks that the extension loaded is of a valid type.
+     *
+     * @param  mixed $plugin
+     * @return void
+     * @throws InvalidServiceException if invalid
+     */
+    public function validate($plugin)
+    {
+        if ($plugin instanceof Extension\AbstractRenderer) {
+            // we're okay
+            return;
+        }
+
+        if ('Feed' == substr(get_class($plugin), -4)) {
+            // we're okay
+            return;
+        }
+
+        if ('Entry' == substr(get_class($plugin), -5)) {
+            // we're okay
+            return;
+        }
+
+        throw new InvalidServiceException(sprintf(
+            'Plugin of type %s is invalid; must implement %s\Extension\RendererInterface '
+            . 'or the classname must end in "Feed" or "Entry"',
+            (is_object($plugin) ? get_class($plugin) : gettype($plugin)),
+            __NAMESPACE__
+        ));
+    }
+
+    /**
+     * Validate plugin (v2)
+     *
+     * @param mixed $plugin
+     * @return void
+     * @throws Exception\InvalidArgumentException when invalid
+     */
+    public function validatePlugin($plugin)
+    {
+        try {
+            $this->validate($plugin);
+        } catch (InvalidServiceException $e) {
+            throw new Exception\InvalidArgumentException(sprintf(
+                'Plugin of type %s is invalid; must implement %s\Extension\RendererInterface '
+                . 'or the classname must end in "Feed" or "Entry"',
+                (is_object($plugin) ? get_class($plugin) : gettype($plugin)),
+                __NAMESPACE__
+            ));
+        }
+    }
+}