Cleanup error handler mixin
Added handler to stop errors being swallowed
Cleanup
Mended admin page callbacks :P
Mended add attendee component callbacks :P
No point in clearing the checkboxes

There will never be any point in clearing the checkboxes,
as when this code works properly, anything that is checked will be hidden away.
Small refactor, mended locale stuff
DRY slightly
Tell the attendees they no longer have pending removal requests, not that they do
Added displayable_attendees attribute to the ball_table model. Not entirely sure if it works yet
Plumbed in displayable_attendees, cleanup
CSS tweaks, realism
Updated old anchor to new EmberJS arch
Only inform of success on success