[spec/models] Add to_s spec for specialty
[gem] Update gaku_forms to 0.1.5
[spec/requests] Improve admin/achievements
[controllers] Use responders in admin/achievements and improve controller spec
[views] Improve admin/achievements
[spec/models] Add to_s spec to achievement_spec
[spec/requests] Improve admin/grading_methods
[factories] Add invalid_grading_method factory
[controllers] Use responders in admin/grading_methods and add controller spec
[views] Improve admin/grading_methods
[spec/models] Improve grading_method_spec
[spec/request] Improve admin/grading/grading_method_set
[factories] Add invalid_grading_method_set factory
[controllers] Use responders in admin/grading_method_sets and add controller spec
[spec/models] Add make_primary spec for grading_method_set_spec
[views] Improve admin/grading_method_sets
WIP
merged master