title: How add new method in Sonata CRUD controller?
body: <p>In CRUDController of SonataBundle are a lot of actions, for example listAction(), editAction() etc. 
  For user managment is link:</p>
  
  <pre><code>http://site.local/app_dev.php/admin/sonata/user/user/list
  </code></pre>
  
  <p>and route for this:</p>
  
  <pre><code>admin_sonata_user_user_list       -  /admin/sonata/user/user/list
  </code></pre>
  
  <p>I would like add own action for this controller: listSecondAction();</p>
  
  <p>I copy method listAction and change name to listSecondAction. Next i open</p>
  
  <pre><code>http://site.local/app_dev.php/admin/sonata/user/user/listSecond
  </code></pre>
  
  <p>and i have error:</p>
  
  <pre><code>No route found for "GET /admin/sonata/user/user/listSecond"
  </code></pre>
  
  <p>So how can i add and where routing for this action? How should i enter to this routing?</p>