Made selleckt trigger change event on original select when selection is modified

@grahamscott - Please review.

NB: When I'm triggering change on the original select I'm also passing in {origin: selleckt}. This is done so that we can determine which events where triggered by selleckt itself and avoid an event-loop. We don't want $originalSelectEl.on('change') to fire unless the event was triggered from "outside".

Hope that makes sense.