git 命令行自动补全
本来是通过apt-get安装的git，但今天为了确认一个问题是不是git的bug，下载代码自己编译了一把，升级到1.8.x。（编译过程参考官方文档，很简单）
但是卸载掉之前的安装版本后发现git的自动补全功能没有了，官方文档有介绍怎么弄，原来是一个脚本实现的。
If you use the Bash shell, Git comes with a nice auto-completion script you can enable. Download the Git source code, and look in the contrib/completion directory; there should be a file called git-completion.bash. Copy this file to your home directory, and add this to your .bashrc file:
source ~/.git-completion.bash
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