Sphinx installation is now optional.
Updated Debian packaging.
Small build fix when Sphinx is installed but not Babel
Debian packaging: SQLAlchemy is needed to build the docs
Also add twisted-core as build dependancy
Merge remote-tracking branch 'upstream/master'

Conflicts:
	setup.py
Fixed manpage path
merge
Add unit-tests for utils/parsedates + fix utils.check_url
Add some unit tests for listen/sync modules + fix help
fix knwon_users admins
Add a post_hook mechanism for modules (see pipobot.conf.yml for a simple example)
Merge branch 'master' into python3