Use power of symfony binary file response

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Fix typo

Remove extra line

lib/Alchemy/Phrasea/Core/Provider/XSendFileMappingServiceProvider.php

@@ -0,0 +1,47 @@
+<?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\Provider;
+
+use Alchemy\Phrasea\XSendFile\Mapping;
+use Alchemy\Phrasea\Exception\InvalidArgumentException;
+use Silex\Application;
+use Silex\ServiceProviderInterface;
+
+class XSendFileMappingServiceProvider implements ServiceProviderInterface
+{
+    public function register(Application $app)
+    {
+        if (!isset($app['xsendfile.mapping'])) {
+            $app['xsendfile.mapping'] = array();
+        }
+
+        if (!is_array($app['xsendfile.mapping'])) {
+            throw new InvalidArgumentException('XSendFile mapping must be an array');
+        }
+
+        $app['phraseanet.xsendfile-mapping'] = $app->share(function($app) {
+            $mapping = array();
+            foreach($app['xsendfile.mapping'] as $path => $mountPoint) {
+                $mapping[] = array(
+                    'directory' => $path,
+                    'mount-point' => $mountPoint,
+                );
+            }
+
+            return Mapping::create($app, $mapping);
+        });
+    }
+
+    public function boot(Application $app)
+    {
+    }
+}