Add method to get geom to council geo serializer.
Add method to get geom to council geo serializer.

DRF knows to look for 'get_'+'GeometrySerializerMethodField-name' as the
way of getting a geometry field. So we can just point
'get_geography_model_geo_field' at the CouncilGeography model geography field.

The new mixin is to DRY out the methods for getting contact information etc.

DemocracyClub/UK-Polling-Stations,DemocracyClub/UK-Polling-Stations,DemocracyClub/UK-Polling-Stations