Categories!

Grab the scoring categories from the ESPN settings. This doesn't work
with category scoring, simply points... right now. The points field is
nullable, so just the CategoryService needs to change to expect
something slightly different.
Result dates!

A lot of the groundwork for saving results. We'll need an "update"
method that does a minimum of the latest two dates and whatever else
needs doing, and a "full" update that refreshes all results for a given
team. The groundwork is laid for both, though. I'll write the actual
endpoints when I need them for the UI.

Next up is probably Players, since the Stat object needs 'em.