BitmapData.addToWorld will create a new Phaser.Image object, assign the BitmapData to be its texture, add it to the world then return it.
BitmapData.copyPixels now accepts a Sprite, Image, BitmapData, HTMLImage or string as its source.
Loader.tilemap has renamed the `mapURL` parameter to `url` and `mapData` to `data` to keep it consistent with the other Loader methods.
Loader.physics has renamed the `dataURL` parameter to `url` and `jsonData` to `data` to keep it consistent with the other Loader methods.
First draft of the Asset Pack JSON format.