Api cleanup

[brilee]

Making some API changes as discussed in #34

@Kashomon @amj @duckpunch

[brilee]

There's some breaking changes in this PR - game_server is renamed server_id and to create a game, you no longer refer to which server it was played on (kgs) but rather than server's ID (1). That server ID is the same one that appears in the UI for online-ratings.

[brilee]

Some lingering cleanup - the misleadingly named "rated" field is still in the model, but since it's not exposed anywhere, it should be okay for now. I still have yet to figure out how database migrations work with flask + docker. Since @Kashomon and @TheObtuseAutodidact are working on some new db fields and stuff, we'll need to figure out how to execute DB migrations. We can just delete and recreate the db for now, but when we have real data on the system, that won't fly anymore.

[amj]

Looks great to me. IIUC, we still have a couple basic ops items outstanding:

• how to deploy (to dev, test, and prod)
• how do db migrations.