git submodule 좋은듯 하면서 조금은 불편하네...
http://git-scm.com/book/ko/v1/Git-%EB%8F%84%EA%B5%AC-%EC%84%9C%EB%B8%8C%EB%AA%A8%EB%93%88
// add
git submodule add git://github.com/chneukirchen/rack.git rack
// init
git submodule init
http://stackoverflow.com/questions/1030169/easy-way-pull-latest-of-all-submodules
// git 1.6.1+
git submodule foreach git pull
// git 1.7.3+
git pull --recurse-submodules
// or
git submodule update --recursive
http://stackoverflow.com/questions/1260748/how-do-i-remove-a-git-submodule
.gitmodules
file.git add .gitmodules
.git/config
.git rm --cached path_to_submodule
(no trailing slash).rm -rf .git/modules/path_to_submodule
git commit -m "Removed submodule <name>"
rm -rf path_to_submodule