Bug 1021284 - [camera] [flame] spinner appears after every photo capture

I'm not sure I agree that we should stop using events here to show the loading spinner. We're listening for `camera:ready` to hide it, but not show it. I think the reason you did this was to be able to pass in options, correct?

Couldn't we just pass a parameter with the `busy` event? This way, not all `busy` events would be required to display a loading spinner, but optionally in certain cases we could?