git submodule，解决依赖模块更新

git submodule add 添加项目的依赖模块

$ cd demo_project
$ git submodule add git://github.com/felixge/node-mysql.git deps/mysql
$ git submodule init
$ git submodule update
# 提交更改

git submodule init and update 就可以直接获取依赖模块了

$ git submodule init

Submodule'deps/connect'(git://github.com/senchalabs/connect.git) registered for path 'deps/connect'
Submodule'deps/connect-form'(git://github.com/visionmedia/connect-form.git) registered for path 'deps/connect-form'
Submodule'deps/express'(git://github.com/visionmedia/express.git) registered for path 'deps/express'
Submodule'deps/formidable'(git://github.com/felixge/node-formidable.git) registered for path 'deps/formidable'
Submodule'deps/jqtpl'(git://github.com/kof/node-jqtpl.git) registered for path 'deps/jqtpl'
Submodule'deps/mime'(git://github.com/bentomas/node-mime.git) registered for path 'deps/mime'
Submodule'deps/mysql'(git://github.com/felixge/node-mysql.git) registered for path 'deps/mysql'
Submodule'deps/node-weibo'(git://github.com/fengmk2/node-weibo.git) registered for path 'deps/node-weibo'
Submodule'deps/nodeunit'(git://github.com/caolan/nodeunit.git) registered for path 'deps/nodeunit'
Submodule'deps/qs'(git://github.com/visionmedia/node-querystring.git) registered for path 'deps/qs'

$ git submodule status

4b5a36540b26ce13e1d7af3e0a1f2341730d03db deps/connect (1.3.0)
e861cc85d66e13dbc3a671c1ac72af988de20100 deps/connect-form (0.2.1)
961146a287b00d30285a33041eade42a0b3c92ec deps/express (2.2.1-6-g961146a)
5d98e9c75c8642c1a3f39d1741b839cc44aa2be7 deps/formidable (v0.9.11-2-g5d98e9c)
72abc952c779a994ac94dd79a198638b7b1e1cec deps/jqtpl (heads/master)
da62624813ef2790834a683fa487a74d2f5ea7b4 deps/mime (heads/master)
0790eba1a8caf90385bc5ec52f2b9a438f270e80 deps/mysql (v0.9.1-2-g0790eba)
23e7427da78bbf934a2eb8007dfd372c1a025e2a deps/node-weibo (heads/master)
121df84c6865e7e57d19c51eb742313db3dedaed deps/nodeunit (0.4.0-60-g121df84)
534b70356c9f615a50c54534d20b4c3e650e1072 deps/qs (0.0.7-1-g534b703)