Switch from iTerm2 splits to Tmux.
Alias for common Vagrant command.
Fix typo in bin/todayprogramme.
Add some things to vimrc.
Mutt config overhaul.

Mostly based on Steve Losh's excellent "Homely Mutt" article:
http://stevelosh.com/blog/2012/10/the-homely-mutt/
Move global gitignore into dotfiles.