Remove flickr oauth, add google oauth
Change in db structure, improve error handling for profile change

Fields added to users: display_name, birthdate & location
Fields deleted from users: flickr_uid, manager
Fields added to trips: flickr_uid, flickr_setid (renamed from photos)
Table participants added
Cleanup
Change from photos to flickr_setid and flickr_uid (set flickr_uid automatically)
Update to Rails 4.1.4 from 4.0.4