Installation:

    git clone https://github.com/gmauricio/vim ~/.vim

Create symlink:

    ln -s ~/.vim/vimrc ~/.vimrc

Switch to the `~/.vim` directory, and fetch submodules:

    cd ~/.vim
    git submodule update --init

Install plugin as submodule:

    cd ~/.vim
    git submodule add <git_repo_url> bundle/<plugin_name>
    git add.
    git commit -m " ... whatever ... "

Upgrading a plugin bundle:

    cd ~/.vim/bundle/<plugin_dir>
    git pull origin master

Upgrading all bundled plugins:

    git submodule foreach git pull origin master