UPGRADE FROM 2.0 to 2.1

** Work In Progress - Please do not use this code in production **

Due to some refactoring in the Form Component, some types definition have been changed and new ones have been introduces:
- sonata_type_model : this type now only render a standard select widget or a list widget (if multiple option is set)
- sonata_type_model_list : this type replaces the option edit = list provided as a 4th arguments on the sonata_type_model