add git version 1.8 support by just provide a typo

see:
http://stackoverflow.com/questions/8626724/egg-el-is-loaded-but-egg-minor-mode-is-not-enabled-no-c-x-v-key-bindings
for details
Merge pull request #55 from xiaohanyu/master

add git 1.8 support

I'm sorry to be late merging.
Thank you for your pull request !