Double-check that RAA adds up at a team level

[beanumber]

This is worth thinking about:

https://twitter.com/tangotiger/status/605172517553082368

I think that RAA will add up, across categories, for each team, but it's worth double-checking.

The way to do this would be to re-write getRAA() so that you can group at the team level. Or better yet, have getRAA() accept an argument that would be passed to dplyr::group_by(). This would actually be pretty useful. Not sure how tricky this would be...