Added column definitions to raids > standings datatable.
Fixed StandingEvent.change points calculation issue where doubling for `:delinquent_gain" events from characters that were attending the raid was causing extra points in the system.  Added Standing.Event.has_attendance_loss method for use in `.process_children`, allowing child-applied multipler to adjust for attendee parent events. (closes #55)
 Added tardyness raid_pages_spec test.
 Greened all exisitng tests.