pep8s a few things
let's do this thing.
adding mission models in
adding a very unfinished rules model
meal model in place
realizes we don't actually need a separate texting app just yet
Add a settings.py file.
Slightly more idiomatic way to convert a dictionary to a list of tuples.
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.