title: how to update CRUD controller generated with symfony 2.4 console
body: <p>I generated my Controllers/Forms in Symfony 2.4 with following command:</p>
  
  <pre><code>php app/console generate:doctrine:crud bundle:Entity
  </code></pre>
  
  <p>Now I made some changes in the entity class and would like to run this command again but I always get </p>
  
  <pre><code>[Runtime Exception]
  Unable to generate the controller as it already exists.  
  </code></pre>
  
  <p>even if I remove the appropriate files in <code>./Controller</code> and <code>./Form</code></p>