8.5 Total badges display

Removes single-day badges from the "badges sold" count.

Does not yet include code to display each day's badge sales, but this should be merged anyway.
This count excludes paid Supporter badges.  You should probably say ``badge_type__in=[ATTENDEE_BADGE, SUPPORTER_BADGE]``, or else your count will be off by like a hundred people, or however many Supporter registrations we got.