* Updated config doc comments.
* Check undefined without typeof. Discussion: https://stackoverflow.com/a/22053469/187883
* Use transparent bg color by default if alpha is true.
* Set bg color on parent to avoid flash.
* render->create (so it doesn't seem like it's about drawing).
* Sorted members.
* Use addEventListener, else only the last player event handler is used.
* Set the initial animation when loaded, not whenever track 0 is empty.
* If an animation is not specified, play an empty animation.
* If an animation is set in success(), don't set any animation.
* Don't clearTracks in setAnimation, don't use AnimationState in calculateAnimationViewport -- those prevent mixing.
* setAnimation returns the TrackEntry.
* Added addAnimation and setViewport.
* Expose play() and pause().
* Keep control bones inside the canvas.
* LoadingScreen scales down.
* Set minimal CSS so no external CSS is needed when !showControls.
* Use screen instead of world coordinates for control bone hit detection, so it works at any size.
* Choose closest control bone instead of last.
* Rendering, added support for separate color/alpha src blend funcs.
* LoadingScreen, set camera zoom to fade out and black flash, use PMA to fix ringing artifacts when scaled, fade in to help hide dropped frames as page loads, use separate color/alpha src blend funcs to properly blend quad when loading screen fades out, oxipng PNGs.
* Moved some private constants out of their class to avoid class name prefix.
* Player, clean up full pass OCD town, showError throws when possible so stacktrace isn't lost, added showLoading to config, don't create UI when !showControls, removed findWithId (id is unique for entire document), use built-in for findWithClass/contains, var->let, don't clear screen twice during loading, other minor stuff.
