District Instance
list: Return all districts, which can filter ballot items.
retrieve: Return a specific district, which can filter ballot items.
GET /api/districts/3576/?format=api
http://michiganelections.io/api/districts/3576/?format=api", "id": 3576, "category": "Precinct", "name": "City of Menominee, Precinct 4" }{ "url": "