Installation:
  cd ~
  git clone http://github.com/boboism/dotvim.git ~/.vim
  ln -s ~/.vim/vimrc ~/.vimrc
  ln -s ~/.vim/gvimrc ~/.gvimrc
  cd ~/.vim
  git submodule init
  git submodule update

Installing a plugin bundle:
  cd ~/.vim
  mkdir ~/.vim/bundle
  git submodule add http://github.com/tpope/vim-fugitive.git bundle/fugitive
  git add .
  git commit -m "Install Fugitive.vim bundle as a submodule."
  echo "\tignore = dirty" >> "~/.vim/.gitmodules"

Upgrading a plugin bundle:
  cd ~/.vim/bundle/fugitive
  git pull origin master

Upgrading all bundled plugins:
  git submodule foreach git pull origin master