Automated tests using dovecot

[Ethan Glasser-Camp]

Hi guys,

I know that patches generally get sent to the mailing list, but this is 
a few hundred K of very WIP stuff so I'm just going to point to my 
github branch:

https://github.com/glasserc/offlineimap/tree/volatile%2Fautomated-tests

This commits a bash-based test harness imported from notmuch, which was 
originally imported from git.  It demonstrates a test that brings up a 
local, non-root dovecot instance, delivers a mail to it, and then syncs 
that mail using offlineimap.

This doesn't go as far as Nicolas suggested in [1], because there's no 
chroot and at least once before I got everything setup correctly, 
offlineimap tests tried to sync against my actual, real mailbox.  
Nevertheless it's pretty simple and better than nothing :)

Feedback would be gratefully received.

Ethan

[1] http://article.gmane.org/gmane.mail.imap.offlineimap.general/2146/