Easier to read subject prefix for git format=email

Git format=email defaults to a subject prefix of [PATCH] which makes
sense if you're actually emailing patches around. I'm just using
format=email as an easy way to read commits so a prefix of [git] makes
more sense.

e.g. [git] Easier to read subject prefix for git format=email
Remove vim-coffee-script plugin: I'm not using it
Remove vimroom plugin: I'm not using it
Add vim-ruby plugin for better syntax highlighting

Specifically vim-ruby supports new 1.9 syntax hash syntax highlighting.
First draft of bin/git-wtf

Format the last commit message for the given file (or given file and
line number) as an email.
Add utf-8 setting to tmux
Use zeus to run rspec in RunTests
Enable git rerere