District Instance
list: Return all districts, which can filter ballot items.
retrieve: Return a specific district, which can filter ballot items.
GET /api/districts/10270/?format=api
http://michiganelections.io/api/districts/10270/?format=api", "id": 10270, "category": "Ward", "name": "City of Eaton Rapids, Precinct 3" }{ "url": "