Admins can modify and delete gates #100
#142 피드백 처리
#100 showing error messages
Merge pull request #137 from DonutWorks/feat/issue-#100

Admins can modify and delete gates #100
Merge pull request #143 from DonutWorks/refact/feedback_140915

#142 피드백 처리
Merge pull request #144 from DonutWorks/remove_unused_spec_file

#134 사용하지않는 RSpec 코드 삭제
hang out merging