silexphp/Silex — pull request #979 by voronkovich (2014-07-09 00:22:26+00:00)
Title: Add an ability to users to add their own custom form types

Example:
```php
$app->extend('form.type.custom_types', function($customTypes) {
$customTypes[] = new DummyFormType();
return $customTypes;
});
...
$form = $app['form.factory']->createBuilder()
->add('dummy-field', 'dummy')
->getForm();
```