Consolidate au_navitia.json
The au_navitia.json is the same as the generic un_navitia.json expect it specifies the "au" coverage for Australia.
It would be great if we could use a coverage map in un_navitia.json to specify the coverage argument instead of having a custom au_navitia.json.
This is a tracking issue to eventually remove au_navitia.json and instead support un_navitia.json having custom coverage arguments based on location. That way Australians can use the generic un_navitia.json