Add RSVP details to volunteer role assignment page
 * Show assigned roles totals on organizer console
 * Various copy edits
Merge branch 'master' of https://github.com/lilliealbert/bridge_troll into lilliealbert-master
Added test event to things created by db:seed
Remove numerous events_helper functions for displaying or sorting volunteers

All ActiveHash classes (Role, VolunteerAssignment, and now VolunteerPreference) now use
ActiveHash::Enum instead of hand-defined constants. This means now if you want a role_id
you have to do Role::VOLUNTEER.id, because Role::VOLUNTEER is a role instance.