Rework awesome bash prompt
Rework awesome bash prompt

* Address issue surfaced in PR #68, improving on submitted code
* Prefix all prompt globals with __, eg __prompt_vcs_info
* Prefer git to svn

junjizhi/dotfiles-1,jesperronn/cowboy-dotfiles,jesperronn/cowboy-dotfiles,austinrivas/dotfiles,unicell/dotfiles,CodisRedding/dotfiles,davestephens/dotfiles,cowboy/dotfiles,montyubuntu/dotfiles,drzax/dotfiles,whizzzkid/dotfiles,ricardorsierra/dotfiles,tkruse/dotfiles,ricardorsierra/dotfiles,montyubuntu/dotfiles,junjizhi/dotfiles-1,unicell/dotfiles,montyubuntu/dotfiles,CodisRedding/dotfiles,unicell/dotfiles,ricardorsierra/dotfiles,davestephens/dotfiles,ekilmer/dotfiles,montyubuntu/dotfiles,ekilmer/dotfiles,jesperronn/cowboy-dotfiles,unicell/dotfiles,cowboy/dotfiles,tkruse/dotfiles,whizzzkid/dotfiles,junjizhi/dotfiles-1,whizzzkid/dotfiles,drzax/dotfiles,davestephens/dotfiles,CodisRedding/dotfiles,austinrivas/dotfiles,cowboy/dotfiles,whizzzkid/dotfiles,ricardorsierra/dotfiles,ekilmer/dotfiles,davestephens/dotfiles,CodisRedding/dotfiles,cowboy/dotfiles,drzax/dotfiles,junjizhi/dotfiles-1,jesperronn/cowboy-dotfiles