Requirements:
git clone https://github.com/magicmonty/bash-git-prompt.git
pip install virtualfish
# rvm (See http://rvm.io/ for more info)
curl -sSL https://rvm.io/mpapis.asc | gpg --import -
curl -sSL https://get.rvm.io | bash -s stable
curl -L --create-dirs -o ~/.config/fish/functions/rvm.fish https://raw.github.com/lunks/fish-nuggets/master/functions/rvm.fish