UK:DW Added select related in metadata viewset
Merge pull request #720 from onaio/699_improve_metadata_endpoint_performance

UK:DW Added select related in metadata viewset
PLD: allow anyone to get org profiles, closes #718
PLD: org list is now accessible by anon but returns an empty list
Merge pull request #719 from onaio/718-allow-orgs-for-everyone

PLD: allow anyone to get org profiles, closes #718
ME: fixed wrong response error; changed the order of renderers to default to JSON
ME: return json format if format is not provided
ME: reverted back to initial changes; raise error when format is not json