Simplified 'form_type' option
Simplified 'form_options' option and added 'form_from_options' and 'form_to_options' options
Added missing methods in DataSourceViewInteface and DataSourceView
Added 'form_order' option useful to prioritize fields in filter form
Merged in chives/datasource (pull request #5)

Reorganizacja opcji  Symfony\FormExtension