mboxevent stuff

[Bron Gondwana]

Thanks for changing the UNSEEN counter name.

I've pushed a small change to make all the types consistent so
that master will built (at least on my Ubuntu 12.10 64bit box)
with -Werror.  I hope you don't mind me fiddling with it now
it's in master!

We're starting to play with replacing our own set of patches to
do event pushing to the browser with an event listener.  Seems
good in testing so far.

Regards,

Bron.
-- 
  Bron Gondwana
  brong at fastmail.fm