DW: Added joined_on field, updated the docs and tests
Merge pull request #717 from onaio/709_added_created_on

DW: Added joined_on field, updated the docs and tests
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
Merge pull request #721 from onaio/636-chart-endpoint-returns-wrong-endpoint-via-curl

ME: fixed wrong response error; changed the order of renderers to default to JSON
UK: Project and ProjectXForm in logger
UK: migrate data from api_project to logger project
UK: add project field to xform
UK: change Project imports

Conflicts:
	onadata/libs/serializers/project_serializer.py
UK: remove api.Project and api.ProjectXForm
UK: update projectxform relation to px_xforms relation, create_default_project also sets the xform.project
UK: set project on xform publishing
UK: add project xform permission, reorder permissions
UK: set default project if project was not provided during form permissions