title: Symfony2 form not validate email and required constraint
body: <p>I have a form like this made with <code>Symfony2</code>:</p>
  
  <pre><code>class UsuarioRegistroType extends AbstractType {
  
    public function BuildForm(FormBuilderInterface $builder, array $options) {
  
      $builder-&gt;add('email', 'email', array('label' =&gt; 'E-mail',  'required' =&gt; true))
  ....
  </code></pre>
  
  <p>Forms works fine, but if I write something like Email: asdf (not email address), I never get the error assosiated with this issue. Also, if I don't write anything, I don't get any error for <code>required constraint</code>.</p>
  
  <p>Any idea with this issue?
  Thanks :)</p>