sort(key, order)
Sort the children in the group according to a particular key and ordering. Call this function to sort the group according to a particular key value and order. For example to depth sort Sprites for Zelda-style game you might call group.sort('y', Phaser.Group.SORT_ASCENDING) at the bottom of your State.update(). Internally this uses a standard JavaScript Array sort, so everything that applies there also applies here, includingalphabetical sorting, mixing strings and numbers, an