学习资料
http://www.liaoxuefeng.com/wiki/0013739516305929606dd18361248578c67b8067c8c017b000
http://rogerdudler.github.io/git-guide/index.zh.html
http://marklodato.github.io/visual-git-guide/index-zh-cn.html
git个性化log:http://www.tuicool.com/articles/Ab6Nru