Add Identity class
Add indentation for logging sent Vesicles
Let Persona inherit from Identity
Let group inherit from Identity

* group.author is now group.admin
* group.groupname is now group.username
Add members attribute to groups
Add config LOG_SQL_STATEMENTS
Sync groups

* Persona.export includes groups
* Persona.(create|update)_from_changeset auto-requests new groups
* Fix Persona contact synchronisation
* Group exports/imports members
* Removed group_created signal
* Send local_model_changed signal for admin after group creation
Merge branch 'sync-groups' into dev

Conflicts:
	astrolab/interestmodel.py
	nucleus/models.py
	run.py
	setup.py
	static/layouts.json
	templates/persona.html
	web_ui/__init__.py
	web_ui/pagemanager.py
	web_ui/views.py