Usage: 
  git clone https://github.com/vinodkl81/vimrc.git
  mv vimrc $HOME/.vim 
  cd $HOME/.vim 
  git submodule update --init
  git submodule foreach git checkout master
  cd $HOME 
  ln -s .vim/vimrc .vimrc 
  ln -s .vim/gvimrc .gvimrc