Previously, we'd export to global objects called spine.canvas, spine.webgl, spine.threejs. Going forward, all Spine APIs will be hosted by the global spine object when the runtime is used straight from the bundled .js files in the build/ folder. This is a minor change with a simple fix on the user side, i.e. replace spine.canvas. with spine.
* Use minified JS and CSS absolute URLs.
* Renamed index.html so the other html file can be reached more easily.
* generator.html doesn't seem to work?
* AssetManager's textureLoader returns Texture.
* AssetManager#loadTexture success gives a Texture.
* TextureAtlas no longer has a textureLoader, it creates all the pages without a texture set.
* TextureAtlasRegion no longer has a texture, use region.page.texture instead.
* AssetManager#loadTextureAtlas no longer parses the atlas text twice. It creates the atlas, then loads and sets all the textures.
* If no config animation, start paused and set one when first clicked (showControls only).
* Updated player editor to 4.0.
* Don't name example index.html to make it easier to reach other files in same dir.
* Adjust CSS.
* 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.
