Add UnprocessableEntityHttpException to HttpKernel Exceptions

src/Symfony/Component/HttpKernel/Exception/UnprocessableEntityHttpException.php

@@ -0,0 +1,32 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\HttpKernel\Exception;
+
+/**
+ * UnprocessableEntityHttpException.
+ *
+ * @author Steve Hutchins <hutchinsteve@gmail.com>
+ */
+class UnprocessableEntityHttpException extends HttpException
+{
+    /**
+     * Constructor.
+     *
+     * @param string     $message   The internal exception message
+     * @param \Exception $previous  The previous exception
+     * @param integer    $code      The internal exception code
+     */
+    public function __construct($message = null, \Exception $previous = null, $code = 0)
+    {
+        parent::__construct(422, $message, $previous, array(), $code);
+    }
+}