dovecot-2.2-pigeonhole: Merged changes from Pigeonhole v0.3 tree.

[pigeonhole at rename-it.nl]

details:   http://hg.rename-it.nl/dovecot-2.2-pigeonhole/rev/0dffac42192b
changeset: 1736:0dffac42192b
user:      Stephan Bosch <stephan at rename-it.nl>
date:      Tue Apr 02 23:14:37 2013 +0200
description:
Merged changes from Pigeonhole v0.3 tree.