Change model to allow 0..n owners per place.
Update authorization rule: current user must be one of the assigned users of a place.
Update place spec to allow multiple owners, add spec for ownership relation.
Update user relation in place factory.
Update user relation in API response.
Update test data to support shared ownership.
Update CanCan abilities to support multiple owners.
Update factories for shared ownership.
Set user array as ownership in controller instead of single user.
Fix specs.
Add multiple owners model specs.
Add ownerships attribute to place model.
Check 'ownedByCurrentUser' based on new ownerships attribute.
Distinguish between ownership and general authorization (e.g. as admin).
Move ownership to place details, read name/email from user model instead of place model.
Drop contact_name and contact_email columns.
Update test data.
Fix place messaging: contact message will be sent to the (currently only) owner of the place.
Always show 'name' attribute of ownership, not just when authorized.
Move phone number to user model.