added traits for the routes

src/Silex/Route/SecurityTrait.php

+<?php
+
+/*
+ * This file is part of the Silex framework.
+ *
+ * (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 Silex\Route;
+
+use Symfony\Component\Security\Core\Exception\AccessDeniedException;
+
+/**
+ * Security trait.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+trait SecurityTrait
+{
+    public function secure($roles)
+    {
+        $this->before(function ($request, $app) use ($roles) {
+            if (!$app['security']->isGranted($roles)) {
+                throw new AccessDeniedException();
+            }
+        });
+    }
+}