Add tmux config file

This is almost completely taken from:

http://www.linuxized.com/2010/05/switching-from-gnu-screen-to-tmux/

with the exception of the vim pane switching that I added.

This could be the start of something beautiful. As much as I love
screen, it's got some pretty large flaws that tmux supposedly addresses.
Merge branch 'master' of github.com:swoogles/Personal