Harmonize routes, there is now a clear parallel between resources
nested under /api/my and /api.
Routes with /api/my will automatically use the current user,
whereas you have to use /api/users/:user_id/ to access a resource.
This simplifies access to other person (rather than current_user)
profile page & so on
Speed up tests a little bit by creating less records in setup phases
Return correct url on profile page