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diff --git a/vendor/zendframework/zend-feed/src/Writer/Extension/ITunes/Feed.php b/vendor/zendframework/zend-feed/src/Writer/Extension/ITunes/Feed.php
new file mode 100644
index 000000000..2acf80fc9
--- /dev/null
+++ b/vendor/zendframework/zend-feed/src/Writer/Extension/ITunes/Feed.php
@@ -0,0 +1,360 @@
+<?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\Extension\ITunes;
+
+use Zend\Feed\Uri;
+use Zend\Feed\Writer;
+use Zend\Stdlib\StringUtils;
+use Zend\Stdlib\StringWrapper\StringWrapperInterface;
+
+class Feed
+{
+    /**
+     * Array of Feed data for rendering by Extension's renderers
+     *
+     * @var array
+     */
+    protected $data = [];
+
+    /**
+     * Encoding of all text values
+     *
+     * @var string
+     */
+    protected $encoding = 'UTF-8';
+
+    /**
+     * The used string wrapper supporting encoding
+     *
+     * @var StringWrapperInterface
+     */
+    protected $stringWrapper;
+
+    /**
+     * Constructor
+     */
+    public function __construct()
+    {
+        $this->stringWrapper = StringUtils::getWrapper($this->encoding);
+    }
+
+    /**
+     * Set feed encoding
+     *
+     * @param  string $enc
+     * @return Feed
+     */
+    public function setEncoding($enc)
+    {
+        $this->stringWrapper = StringUtils::getWrapper($enc);
+        $this->encoding      = $enc;
+        return $this;
+    }
+
+    /**
+     * Get feed encoding
+     *
+     * @return string
+     */
+    public function getEncoding()
+    {
+        return $this->encoding;
+    }
+
+    /**
+     * Set a block value of "yes" or "no". You may also set an empty string.
+     *
+     * @param  string
+     * @return Feed
+     * @throws Writer\Exception\InvalidArgumentException
+     */
+    public function setItunesBlock($value)
+    {
+        if (! ctype_alpha($value) && strlen($value) > 0) {
+            throw new Writer\Exception\InvalidArgumentException('invalid parameter: "block" may only'
+            . ' contain alphabetic characters');
+        }
+        if ($this->stringWrapper->strlen($value) > 255) {
+            throw new Writer\Exception\InvalidArgumentException('invalid parameter: "block" may only'
+            . ' contain a maximum of 255 characters');
+        }
+        $this->data['block'] = $value;
+        return $this;
+    }
+
+    /**
+     * Add feed authors
+     *
+     * @param  array $values
+     * @return Feed
+     */
+    public function addItunesAuthors(array $values)
+    {
+        foreach ($values as $value) {
+            $this->addItunesAuthor($value);
+        }
+        return $this;
+    }
+
+    /**
+     * Add feed author
+     *
+     * @param  string $value
+     * @return Feed
+     * @throws Writer\Exception\InvalidArgumentException
+     */
+    public function addItunesAuthor($value)
+    {
+        if ($this->stringWrapper->strlen($value) > 255) {
+            throw new Writer\Exception\InvalidArgumentException('invalid parameter: any "author" may only'
+            . ' contain a maximum of 255 characters each');
+        }
+        if (! isset($this->data['authors'])) {
+            $this->data['authors'] = [];
+        }
+        $this->data['authors'][] = $value;
+        return $this;
+    }
+
+    /**
+     * Set feed categories
+     *
+     * @param  array $values
+     * @return Feed
+     * @throws Writer\Exception\InvalidArgumentException
+     */
+    public function setItunesCategories(array $values)
+    {
+        if (! isset($this->data['categories'])) {
+            $this->data['categories'] = [];
+        }
+        foreach ($values as $key => $value) {
+            if (! is_array($value)) {
+                if ($this->stringWrapper->strlen($value) > 255) {
+                    throw new Writer\Exception\InvalidArgumentException('invalid parameter: any "category" may only'
+                    . ' contain a maximum of 255 characters each');
+                }
+                $this->data['categories'][] = $value;
+            } else {
+                if ($this->stringWrapper->strlen($key) > 255) {
+                    throw new Writer\Exception\InvalidArgumentException('invalid parameter: any "category" may only'
+                    . ' contain a maximum of 255 characters each');
+                }
+                $this->data['categories'][$key] = [];
+                foreach ($value as $val) {
+                    if ($this->stringWrapper->strlen($val) > 255) {
+                        throw new Writer\Exception\InvalidArgumentException('invalid parameter: any "category" may only'
+                        . ' contain a maximum of 255 characters each');
+                    }
+                    $this->data['categories'][$key][] = $val;
+                }
+            }
+        }
+        return $this;
+    }
+
+    /**
+     * Set feed image (icon)
+     *
+     * @param  string $value
+     * @return Feed
+     * @throws Writer\Exception\InvalidArgumentException
+     */
+    public function setItunesImage($value)
+    {
+        if (! Uri::factory($value)->isValid()) {
+            throw new Writer\Exception\InvalidArgumentException('invalid parameter: "image" may only'
+            . ' be a valid URI/IRI');
+        }
+        if (! in_array(substr($value, -3), ['jpg', 'png'])) {
+            throw new Writer\Exception\InvalidArgumentException('invalid parameter: "image" may only'
+            . ' use file extension "jpg" or "png" which must be the last three'
+            . ' characters of the URI (i.e. no query string or fragment)');
+        }
+        $this->data['image'] = $value;
+        return $this;
+    }
+
+    /**
+     * Set feed cumulative duration
+     *
+     * @param  string $value
+     * @return Feed
+     * @throws Writer\Exception\InvalidArgumentException
+     */
+    public function setItunesDuration($value)
+    {
+        $value = (string) $value;
+        if (! ctype_digit($value)
+            && ! preg_match("/^\d+:[0-5]{1}[0-9]{1}$/", $value)
+            && ! preg_match("/^\d+:[0-5]{1}[0-9]{1}:[0-5]{1}[0-9]{1}$/", $value)
+        ) {
+            throw new Writer\Exception\InvalidArgumentException('invalid parameter: "duration" may only'
+            . ' be of a specified [[HH:]MM:]SS format');
+        }
+        $this->data['duration'] = $value;
+        return $this;
+    }
+
+    /**
+     * Set "explicit" flag
+     *
+     * @param  bool $value
+     * @return Feed
+     * @throws Writer\Exception\InvalidArgumentException
+     */
+    public function setItunesExplicit($value)
+    {
+        if (! in_array($value, ['yes', 'no', 'clean'])) {
+            throw new Writer\Exception\InvalidArgumentException('invalid parameter: "explicit" may only'
+            . ' be one of "yes", "no" or "clean"');
+        }
+        $this->data['explicit'] = $value;
+        return $this;
+    }
+
+    /**
+     * Set feed keywords
+     *
+     * @param  array $value
+     * @return Feed
+     * @throws Writer\Exception\InvalidArgumentException
+     */
+    public function setItunesKeywords(array $value)
+    {
+        if (count($value) > 12) {
+            throw new Writer\Exception\InvalidArgumentException('invalid parameter: "keywords" may only'
+            . ' contain a maximum of 12 terms');
+        }
+        $concat = implode(',', $value);
+        if ($this->stringWrapper->strlen($concat) > 255) {
+            throw new Writer\Exception\InvalidArgumentException('invalid parameter: "keywords" may only'
+            . ' have a concatenated length of 255 chars where terms are delimited'
+            . ' by a comma');
+        }
+        $this->data['keywords'] = $value;
+        return $this;
+    }
+
+    /**
+     * Set new feed URL
+     *
+     * @param  string $value
+     * @return Feed
+     * @throws Writer\Exception\InvalidArgumentException
+     */
+    public function setItunesNewFeedUrl($value)
+    {
+        if (! Uri::factory($value)->isValid()) {
+            throw new Writer\Exception\InvalidArgumentException('invalid parameter: "newFeedUrl" may only'
+            . ' be a valid URI/IRI');
+        }
+        $this->data['newFeedUrl'] = $value;
+        return $this;
+    }
+
+    /**
+     * Add feed owners
+     *
+     * @param  array $values
+     * @return Feed
+     */
+    public function addItunesOwners(array $values)
+    {
+        foreach ($values as $value) {
+            $this->addItunesOwner($value);
+        }
+        return $this;
+    }
+
+    /**
+     * Add feed owner
+     *
+     * @param  array $value
+     * @return Feed
+     * @throws Writer\Exception\InvalidArgumentException
+     */
+    public function addItunesOwner(array $value)
+    {
+        if (! isset($value['name']) || ! isset($value['email'])) {
+            throw new Writer\Exception\InvalidArgumentException('invalid parameter: any "owner" must'
+            . ' be an array containing keys "name" and "email"');
+        }
+        if ($this->stringWrapper->strlen($value['name']) > 255
+            || $this->stringWrapper->strlen($value['email']) > 255
+        ) {
+            throw new Writer\Exception\InvalidArgumentException('invalid parameter: any "owner" may only'
+            . ' contain a maximum of 255 characters each for "name" and "email"');
+        }
+        if (! isset($this->data['owners'])) {
+            $this->data['owners'] = [];
+        }
+        $this->data['owners'][] = $value;
+        return $this;
+    }
+
+    /**
+     * Set feed subtitle
+     *
+     * @param  string $value
+     * @return Feed
+     * @throws Writer\Exception\InvalidArgumentException
+     */
+    public function setItunesSubtitle($value)
+    {
+        if ($this->stringWrapper->strlen($value) > 255) {
+            throw new Writer\Exception\InvalidArgumentException('invalid parameter: "subtitle" may only'
+            . ' contain a maximum of 255 characters');
+        }
+        $this->data['subtitle'] = $value;
+        return $this;
+    }
+
+    /**
+     * Set feed summary
+     *
+     * @param  string $value
+     * @return Feed
+     * @throws Writer\Exception\InvalidArgumentException
+     */
+    public function setItunesSummary($value)
+    {
+        if ($this->stringWrapper->strlen($value) > 4000) {
+            throw new Writer\Exception\InvalidArgumentException('invalid parameter: "summary" may only'
+            . ' contain a maximum of 4000 characters');
+        }
+        $this->data['summary'] = $value;
+        return $this;
+    }
+
+    /**
+     * Overloading: proxy to internal setters
+     *
+     * @param  string $method
+     * @param  array $params
+     * @return mixed
+     * @throws Writer\Exception\BadMethodCallException
+     */
+    public function __call($method, array $params)
+    {
+        $point = lcfirst(substr($method, 9));
+        if (! method_exists($this, 'setItunes' . ucfirst($point))
+            && ! method_exists($this, 'addItunes' . ucfirst($point))
+        ) {
+            throw new Writer\Exception\BadMethodCallException(
+                'invalid method: ' . $method
+            );
+        }
+        if (! array_key_exists($point, $this->data) || empty($this->data[$point])) {
+            return;
+        }
+        return $this->data[$point];
+    }
+}