The following is from http://rmitc.org/2013/04/modern-vim-plugin-management-pathogen-vs-vundle/

If you want to install a plugin, see if it has a git repo (9 out of 10 times it has a github repo). Find its git url and add to your .vim as a submodule:

cd ~/.vim
git submodule add https://github.com/majutsushi/tagbar.git bundle/tagbar
git submodule add https://github.com/altercation/vim-colors-solarized.git bundle/solarized
git submodule update --init
git submodule foreach git pull origin master

When you need to update your plugins, just run the last line to make git pull updates for all plugins.

Here’s the awesome part: when you’re using a whole new computer and want to get all your vim settings from the cloud, simply clone your github repo, make a symlink for .vimrc and pull all plugins:

cd ~
git clone https://github.com/nhanb/.vim.git .vim
ln -s ~/.vim/vimrc ~/.vimrc
cd .vim
git submodule update --init && git submodule foreach git pull origin master