Extract translations from 'attr' values in forms

Symfony2 not only translates the 'label' attribute of form widgets but it also translates the 'placeholder' and the 'title' attributes of form widgets.

So I guess it would be nice if the JMSTranslationBundle also extracted translations from these attributes from the *Type.php files.

Inside your From-Type:

...
public function buildForm(FormBuilderInterface $builder, array $options) {

   $builder->add('name', 'text', array('label'=>'entity.form.name.label', 
                                       'attr' => array('placeholder' => 'enter.your.name.here', 
                                                       'title' => 'entity.form.name.title'
                                                       )
                                       )
                 );
Handle FormFields where the 'label' is set to false
add tests for placeholder-extraction & blank labels
fixed commit error.
re-added test that I accidentally removed
cleaned up mess I caused when merging my stuff with an update from origin/master
cleaned up mess I caused when merging my stuff with an update from origin/master
rebase and cleanup
rebase and cleanup
rebase and cleanup
Merge pull request #120 from azine/master

Extract translations from form widgets 'placeholder'- and 'title'-attributes