removed uneeded file (the set tag is in the core extension by default)

git-svn-id: http://svn.twig-project.org/trunk@157 93ef8e89-cb99-4229-a87c-7fa0fa45744b

lib/Twig/Extension/Set.php

@@ -1,16 +0,0 @@
-<?php
-
-class Twig_Extension_Set extends Twig_Extension
-{
-  public function getTokenParsers()
-  {
-    return array(
-      new Twig_TokenParser_Set(),
-    );
-  }
-
-  public function getName()
-  {
-    return 'set';
-  }
-}