Use AR::Base#sanitize_for_mass_assignment instead of AR::Base#remove_attributes_protected_from_mass_assignment for ActiveRecord 3
Use AR::Base#sanitize_for_mass_assignment instead of AR::Base#remove_attributes_protected_from_mass_assignment for ActiveRecord 3

see http://github.com/rails/rails/commit/7c86e8e21ba6a1f88226ddd0cf012a563f234d06

amatsuda/state_machine