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diff --git a/vendor/zendframework/zend-feed/src/PubSubHubbub/PubSubHubbub.php b/vendor/zendframework/zend-feed/src/PubSubHubbub/PubSubHubbub.php
new file mode 100644
index 000000000..d7922aca6
--- /dev/null
+++ b/vendor/zendframework/zend-feed/src/PubSubHubbub/PubSubHubbub.php
@@ -0,0 +1,147 @@
+<?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\PubSubHubbub;
+
+use Zend\Escaper\Escaper;
+use Zend\Feed\Reader;
+use Zend\Http;
+
+class PubSubHubbub
+{
+    /**
+     * Verification Modes
+     */
+    const VERIFICATION_MODE_SYNC  = 'sync';
+    const VERIFICATION_MODE_ASYNC = 'async';
+
+    /**
+     * Subscription States
+     */
+    const SUBSCRIPTION_VERIFIED    = 'verified';
+    const SUBSCRIPTION_NOTVERIFIED = 'not_verified';
+    const SUBSCRIPTION_TODELETE    = 'to_delete';
+
+    /**
+     * @var Escaper
+     */
+    protected static $escaper;
+
+    /**
+     * Singleton instance if required of the HTTP client
+     *
+     * @var Http\Client
+     */
+    protected static $httpClient = null;
+
+    /**
+     * Simple utility function which imports any feed URL and
+     * determines the existence of Hub Server endpoints. This works
+     * best if directly given an instance of Zend\Feed\Reader\Atom|Rss
+     * to leverage off.
+     *
+     * @param  \Zend\Feed\Reader\Feed\AbstractFeed|string $source
+     * @return array
+     * @throws Exception\InvalidArgumentException
+     */
+    public static function detectHubs($source)
+    {
+        if (is_string($source)) {
+            $feed = Reader\Reader::import($source);
+        } elseif ($source instanceof Reader\Feed\AbstractFeed) {
+            $feed = $source;
+        } else {
+            throw new Exception\InvalidArgumentException('The source parameter was'
+            . ' invalid, i.e. not a URL string or an instance of type'
+            . ' Zend\Feed\Reader\Feed\AbstractFeed');
+        }
+        return $feed->getHubs();
+    }
+
+    /**
+     * Allows the external environment to make ZendOAuth use a specific
+     * Client instance.
+     *
+     * @param  Http\Client $httpClient
+     * @return void
+     */
+    public static function setHttpClient(Http\Client $httpClient)
+    {
+        static::$httpClient = $httpClient;
+    }
+
+    /**
+     * Return the singleton instance of the HTTP Client. Note that
+     * the instance is reset and cleared of previous parameters GET/POST.
+     * Headers are NOT reset but handled by this component if applicable.
+     *
+     * @return Http\Client
+     */
+    public static function getHttpClient()
+    {
+        if (! isset(static::$httpClient)) {
+            static::$httpClient = new Http\Client;
+        } else {
+            static::$httpClient->resetParameters();
+        }
+        return static::$httpClient;
+    }
+
+    /**
+     * Simple mechanism to delete the entire singleton HTTP Client instance
+     * which forces a new instantiation for subsequent requests.
+     *
+     * @return void
+     */
+    public static function clearHttpClient()
+    {
+        static::$httpClient = null;
+    }
+
+    /**
+     * Set the Escaper instance
+     *
+     * If null, resets the instance
+     *
+     * @param  null|Escaper $escaper
+     */
+    public static function setEscaper(Escaper $escaper = null)
+    {
+        static::$escaper = $escaper;
+    }
+
+    /**
+     * Get the Escaper instance
+     *
+     * If none registered, lazy-loads an instance.
+     *
+     * @return Escaper
+     */
+    public static function getEscaper()
+    {
+        if (null === static::$escaper) {
+            static::setEscaper(new Escaper());
+        }
+        return static::$escaper;
+    }
+
+    /**
+     * RFC 3986 safe url encoding method
+     *
+     * @param  string $string
+     * @return string
+     */
+    public static function urlencode($string)
+    {
+        $escaper    = static::getEscaper();
+        $rawencoded = $escaper->escapeUrl($string);
+        $rfcencoded = str_replace('%7E', '~', $rawencoded);
+        return $rfcencoded;
+    }
+}