protect Enumeration with ActiveModel::ForbiddenAttributesProtection
update changelog
feed permitted params to mass assignments in enumerations_controller
Merge branch 'dev' into fix/ma_enum_controller

Conflicts:
	app/models/permitted_params.rb
	doc/CHANGELOG.md
fix unfortunate typos + review feedback
remove attr_protected from Enumeration
Merge branch 'dev' into fix/ma_enum_controller

Conflicts:
	doc/CHANGELOG.md
introduce render_400 (bad request) method in application controller
it should not be possible anymore to update/create enumerations so that they have a non existent type
Merge pull request #734 from opf/fix/ma_enum_controller

Fix/ma enum controller