* Add migrations to add user roles and party visibility.
* Update schema.rb
* Add admin check in User model
* Implement rudimentary visibility of teams
* Adds checks to Party model
* Hides parties from collection views depending on visibility
* Disallows viewing private parties if you're not the owner
* Add a party's visibility to blueprint
* Add admin mode
The API Controller checks if the user is logged in and whether they are an admin, and checks for the X-Admin-Mode header
* Implement admin mode overrides
* Add admin_mode to authorize
* Note to self: Implement user editing by admins
* Fix syntax error with equality in SQL
* Fix syntax error with method name
* Fix bug in who can see restricted parties
* Add privacy control to user profiles
