Made the Annotation builder automatically pass the EntityManager to Form Elements which need it.

Currently the only way I have found to get my 

`\DoctrineORMModule\Form\Element\EntitySelect`

elements to populate after creating the form using the `AnnotationBuilder` is to call

`$form->get('element_name')->setOptions(array('object_manager', $entityManager);`

after the `AnnotationBuilder` has created the form.

This little mod does it automatically.

Hope you like it.