[spec/requests] Improve admin/types_and_methods/enrollment_status_types
[factories] Add invalid_enrollment_status_type
[controllers] Use responders in admin/enrollment_status_types and add controller spec
[views] Improve admin/enrollment_status_types
[spec/requests] Improve admin/types_and_methods/attendance_types
[factories] Add invalid_attendance_type factory
[spec] Add api helpers to controller_helpers
[controllers] Use responders in admin/attendance_types and add controller spec
[spec] Add have_attributes_matcher
[gem] Add jquery-minicolors-rails
[views] Improve admin/attendance_types
[assets] Remove jquery-minicolors from vendor