Add message handlers for fedocal.

These messages get introduced in fedora-infra/fedocal#24.
Update owner to point-of-contact for pkgdb2.
Handle new package.update message format.
Handle new branch start and complete messages.
Handle messages for new pkgdb collections.
Handle messages for updated pkgdb collections.
Support relative delta stuff for fedocal reminders.
Link directly to fedocal meetings.
Merge branch 'release/0.2.2' into develop
Merge branch 'feature/fedocal' into develop

Conflicts:
	fedmsg_meta_fedora_infrastructure/tests/__init__.py
	setup.py
Keep formatting consistent.
Merge pull request #38 from fedora-infra/feature/packagedb2

Feature/packagedb2
0.2.3
Merge branch 'release/0.2.3'