Editable Outings + Option to Bail

The outing 'creator' ID is now refactored to be an 'organizers' object.
Users who are organizers can now edit the details of existing outings (via Xedit). 
Users who are attendees can now bail (leave) an outing. 
If the last organizer bails, all remaining attendees become organizers.
(Will probably want to build option to choose new organizers later).
If the last attendee bails, the outing is deleted from view and DB.