Use power of symfony binary file response

Add commands

Fix typo

Remove extra line

lib/Alchemy/Phrasea/Core/Event/Subscriber/XSendFileSuscriber.php

@@ -0,0 +1,43 @@
+<?php
+
+/*
+ * This file is part of Phraseanet
+ *
+ * (c) 2005-2013 Alchemy
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Alchemy\Phrasea\Core\Event\Subscriber;
+
+use Silex\Application;
+use Symfony\Component\HttpKernel\KernelEvents;
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+use Symfony\Component\HttpKernel\Event\GetResponseEvent;
+
+class XSendFileSubscriber implements EventSubscriberInterface
+{
+    private $app;
+
+    public function __construct(Application $app)
+    {
+        $this->app = $app;
+    }
+
+    public static function getSubscribedEvents()
+    {
+        return array(
+            KernelEvents::REQUEST => array('applyHeaders', 16),
+        );
+    }
+
+    public function applyHeaders(GetResponseEvent $event)
+    {
+        if ($this->app['phraseanet.configuration']['xsendfile']['enable']) {
+            $request = $event->getRequest();
+            $request->headers->set('X-Sendfile-Type', 'X-Accel-Redirect');
+            $request->headers->set('X-Accel-Mapping', (string) $this->app['phraseanet.xsendfile-mapping']);
+        }
+    }
+}