District Instance
list: Return all districts, which can filter ballot items.
retrieve: Return a specific district, which can filter ballot items.
GET /api/districts/3599/?format=api
http://michiganelections.io/api/districts/3599/?format=api", "id": 3599, "category": "County Commissioner District", "name": "Mecosta County, 7th District" }{ "url": "