wear coveralls.
handle-unauthorized-access
add I18n for cancan
remove unauthorized/manage from locales
modify the redirect when CanCan::AccessDenied
Merge pull request #322 from caok/issue/318-handle-unauthorized-access

Issue/318 handle unauthorized access
Merge pull request #317 from saberma/saberma-enhancement/wear-coveralls

显示 coveralls.io 测试覆盖率
merge.