v1.1.1

Fix perf issue with onFinish callbacks

Internally, to fire a provided onFinish callback, I was binding a listener to the transitionEnd event. Negligently, I forgot to un-bind that listener once the transition completed!

This means that each animation incremented the number of times the onFInish callback was executed - not good at all.

Credit to @IamNotUrKitty to finding, testing, and fixing the issue =D