References:
http://stackoverflow.com/questions/315911/git-for-beginners-the-definitive-practical-guide
http://www.kernel.org/pub/software/scm/git/docs/
http://progit.org/book/
git安装、配置用户名邮箱、SSH服务器搭建
http://www.cnblogs.com/elfsundae/archive/2011/07/06/2099182.html
原文：http://www.cnblogs.com/ToddZhou/p/5095904.html