title: Laravel filter on route group but only in post requests
body: <p>I am using restful controllers. I need to run some filters like auth and custom permissions on them. So I put them in a route group and set filters on that group. In addition I also want to run csrf filter but only on post requests. How to do this in the route group?</p>
  
  <p>Added code for clarification</p>
  
  <pre><code>Route::group(array('before' =&gt; 'auth|allowed|csrf'), function() {
      Route::controller('controller', 'SomeController');
      Route::controller('othercontroller', 'OtherController');
  });
  </code></pre>
  
  <p>I want the csrf only on post routes. I really don't want to add a filter on every controller (there are quite a few);</p>