…pgrade to +3.0.4.
… the controller is now the 3rd argument.
…Cell::Rails still does the same as before.
…whole cell life-cycle much more clean, since we don't have to worry about state. Include the Deprecation module if you want the old behaviour. removed Base#render_state_with_args and friends.
…ss and calls the new method ::build_for, which takes care of the cell building process. protected ::builders and ::build_class_for.