CDB-3565 Add in_database support for connecting as public_db_user
CDB-3565 Reset the schema owner to the user
CDB-3565 Add organization-related migration checks
Stub User.setup_schema
Add spec helper so user is verified valid when creating
Fix OrganizationVisualization spec so no longer depends on relocator
/cc @rochoa
Merge pull request #628 from CartoDB/CDB-3565

Make relocator correctly migrate schema owner and add several consistency checks