District Instance
list: Return all districts, which can filter ballot items.
retrieve: Return a specific district, which can filter ballot items.
GET /api/districts/3574/?format=api
http://michiganelections.io/api/districts/3574/?format=api", "id": 3574, "category": "Precinct", "name": "City of Menominee, Precinct 2" }{ "url": "