[trojita] GnuPG-Support

[Stephan Platz]

Hi folks,

for those interested, I started working on GnuPG-Support for trojitá a few 
days ago. The current development can be found on gitorious 
(http://gitorious.org/trojita/paalsteeks-trojita/source/gpg).

Currently I have implemented rudimentary signature verification and it's 
far  from stable. Please note that caching breaks the verifiaction.

At this point I want to thank Jan Kundrát for helping me out a few times 
when I was stuck. I appreciate the constructive comments.

Greetings,
paalsteek