* Switch principal_id to a TextField in Syndicate models, since it's not going to point to a User forever.
* Bugfixes to syndicatelib and sync_volume.py from testing.
Merge branch 'master' of https://github.com/jcnelson/syndicate

Conflicts:
	opencloud/syndicate_observer/steps/sync_volume.py
	opencloud/syndicate_observer/syndicatelib.py