Add canonical names for Washington offices and parties to fixtures

[ghing]

Add canonical names of Washington offices and parties to the fixtures in us/fixtures/office.csv and us/fixtures/party.csv. These are used by the transforms to create the normalized records and relations.

These fixtures create office and party records using the load_metadata.run task (docs and then looked up in the transforms (here's an example from MD)

Doing this will likely be an iterative process as you work through the RawResult records created in the loader.

[ericlagergren]

Current progress on office.csv: https://gist.github.com/EricLagerg/5ca344ca97f5c9714b68

Parties will come in a bit, probably a week after the election (which is Nov 5th) because we still have to do last-minute GOTV, then collect signs, then possibly ballot rehabbing if there's a manual recount (which is, unfortunately, likely).