Don't track pandoc templates
Add basic `mutt` tools

This basically followed [Steve Losh’s][sl] tutorial with some help from
other sites.  At some point, I’ll get around to writing up what I did…

[sl]:   http://stevelosh.com/blog/2012/10/the-homely-mutt/
Try default manpage look for a while
Force tmux to use 256 colors