Merge pull request #50 from huyuanzhe/Data#40_yuanzhe

Data#40_yuanzhe->wangfeng
OK
Add nodegit module
Merge pull request #51 from v11985/data#40_wangfeng

Add nodegit module->yuanzhe
Merge pull request #52 from huyuanzhe/Data#40_yuanzhe

Data#40_yuanzhe->wangfeng
OK