Add queue and chain logic #1

The queue function will add a "play" object or string (or array of them) to a queue.

If the queue was previously empty, the queue will be executed and animations will begin immediately.

Callbacks will be available for each animation and when the queue is empty.

Queue items can be added at any time.

A clearQueue function will reset the animation and clear all items from the queue

The existing play function will use the queue logic but clear the queue each time it's invoked.

A chain function, though similar to queue, will clear the queue before filling it up again.