To install on another machine:

cd ~
git clone https://github.com/ahmadvaroqua/vg-vim.git ~/.vim
ln -s ~/.vim/vimrc ~/.vimrc
ln -s ~/.vim/gvimrc ~/.gvimrc
cd ~/.vim
git submodule init
git submodule update

OR in one line (for the last two git commands):
git submodule update --init