http://stackoverflow.com/questions/8650310/switch-to-another-branch-without-changing-the-workspace-files
http://pseg.or.kr/pseg/?mid=qna&search_target=tag&search_keyword=%ED%98%95%EC%83%81%EA%B4%80%EB%A6%AC&document_srl=4266
http://dimdim.tistory.com/entry/GIT에-대한-내용정리-정리중
http://minsone.github.io/git/git-addtion-and-modified-delete-tag
http://blog.daum.net/_blog/BlogTypeView.do?blogid=0PhZr&articleno=81&categoryId=0®dt=20101210195824