Add the ability for zsh themes to differentiate between untracked files and a simply dirty repository.
Coppied from (Steve Losh's)[https://github.com/sjl/oh-my-zsh/] fork.
He didn't seem to be making a pull request, so here's one.
Tweaks to lib/git.zsh to include untracked flag
you might want to try rewriting this using the --porcelain option. it is designed to be used in scripts and is guaranteed to be stable.