title: Disable CSRF protection on Forms with Silex
body: <p>I'm currently using Silex for a small project. I've registered the form service that way:</p>
  
  <pre><code>$app-&gt;register(new Silex\Provider\FormServiceProvider(), array(
      'form.class_path' =&gt; __DIR__ . '/../vendor/symfony/src',
  ));
  </code></pre>
  
  <p>And create a form using <code>$form = $app['form.factory']-&gt;createBuilder('form');</code></p>
  
  <p>I need to embed a form in an html email, but the CSRF protection don't allow me to directly answer the form inside the email.</p>
  
  <p>How to disable the protection, for this particular form or for all the others (I know how to do it in Symfony2 but not in Silex..)</p>
  
  <p>Thanks a lot for your answers!</p>