publicize ClassYears#show
fix sorcery activity_logging
Merge pull request #49 from iTakeshi/publicize_class_year_show

publicize ClassYears#show
Merge pull request #51 from iTakeshi/fix_sorcery

fix sorcery activity_logging
update readme
秘伝のタレ改
add html minifier
fix typo
Merge pull request #53 from endaaman/update-build-process

Update build process
bundle update
fix and refactor specs
check activation/approval states
Merge pull request #54 from iTakeshi/check_state

Check state
handle malformed json
fix attribute name
Merge pull request #55 from iTakeshi/handle_invalid_json

handle malformed json
return validation errors
Merge pull request #58 from iTakeshi/return_validation_errors

return validation errors