Use erb for admin menu
[wip]
[locale] for import file
Merge pull request #322 from Genshin/locales_for_imex

[locale] for import file
[spec/libs] grading methods
[lib/ordinal] add 0 percentage  criteria if not exist
[locale] notice for import action
[controller] redirect_to login
Merge pull request #323 from Genshin/locale_for_import_action

[locale] notice for import action
Merge pull request #324 from Genshin/redirect_to_login

[controller] redirect_to login
[fix] show exam id not exam object
[style] fixes
[calculations oject] single & collection
[spec/lib] criteria readabiliy
[spec/controller] fix no user logged
Merge pull request #326 from Genshin/fix_student_controller_spec

[spec/controller] fix no user logged
[travis] add libs to test env
[migrate] rename method to grading_type; add default for curved
[sample] change method to grading_type
[spec/lib/model] rename method to grading type