http://vimcasts.org/episodes/synchronizing-plugins-with-git-submodules-and-pathogen/

Installing your Vim environment on another machine

Once your vim configuration is under version control, it’s quite
straightforward to import your settings to any machine that has git installed.
If you followed the instructions above to put your vimrc and plugins in a
dotvim directory, then you can follow these steps to synchronise them to
another machine:

cd ~
git clone git@github.com:jwineinger/dotvim.git ~/.vim
ln -s ~/.vim/vimrc ~/.vimrc
cd ~/.vim
git submodule update --init


# To add a new plugin as a submodule
cd ~/.vim
git submodule add git://github.com/user/repo.git bundle/name
git ci -a -m "Added new bundle/submodule"
git push