Merge Player and Registration.

Mostly to see how it looks; it feels simpler this way. Certainly we
won't have to be juggling Players, Users, and Registrations as much
with this setup. We might have redundant data between games, but we
won't have to worry about losing information, or the stats rotting
over time.
Create a FeedCodeField with a custom validator.
Merge branch 'player_model' into feature/jeff_refactor
A start to registration and meals.

Probably does not work yet.
Fix mixup between User Form and FormView.
Fix length validation.

Apparently fields don't allow a min_length parameter, so I used a custom
validator.
Style tweaks.
I think description should be nullable.
Remove PlayerSetting.

We can add it back in later, under some different guise. But I'd rather
keep things simple to start with.
Remove extraneous settings.py from inner app folder.
Syntax fixes.
Fix some nasty circular import issues.
More syntax and import fixes.

We can now load a registration page.
Conditionalize template caching.
More fixes.

Signing up a user account now works (no success page, though...)
Add an initial_data fixture corresponding to current models.
Add MonolithController to data fixture.
Mark currently-running games as "active".

There can only be one active game at a time, and creating a new active
Game will deactivate any older ones.
Style and personal preference.
Automatically uppercase feed codes.