todo.txt: Add some more aliases
Ignore .netrwhist
Add CA-Cert certificate
Ignore mbsync config file (for now)
Ignore mutt cache
Mutt: add solarized colors submodule
Mutt: add basic configuration

* cf. http://stevelosh.com/blog/2012/10/the-homely-mutt/
Mutt: add smtp delivery via msmtp
Mutt: add basic pgp configuration

* cf. http://dev.mutt.org/trac/wiki/MuttGuide/UseGPG
Mutt: add obscure auto pgp generation script which doesn't work

* cf. http://erack.de/download/generate_pgp_auto
Mutt: update crypto info