Merge pull request #1 from snipwu/master

修改了mac下的配置文件，可以在git仓库文件夹里看到git的所在分支
simplify installation
simplify installation
Supercharge Command Line's History Search

Signed-off-by: Zealot Ke <chzealot@gmail.com>
remove "-n" option for grep

Signed-off-by: Zealot Ke <chzealot@gmail.com>
call `ulimit -u` with `bash -c` wrappered

Signed-off-by: Zealot Ke <chzealot@gmail.com>
fix for unlimited

Signed-off-by: Zealot Ke <chzealot@gmail.com>
Update README.md