add Twig & refactor poche

inc/Twig/Sandbox/SecurityPolicyInterface.php

@@ -0,0 +1,24 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Interfaces that all security policy classes must implements.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+interface Twig_Sandbox_SecurityPolicyInterface
+{
+    public function checkSecurity($tags, $filters, $functions);
+
+    public function checkMethodAllowed($obj, $method);
+
+    public function checkPropertyAllowed($obj, $method);
+}