New class: duplicate of Phaser.TilemapLayer modified to access the new PIXI.Tilemap WebGL based tile renderer.

This is just the first test which actually produces some visible output (the map is drawn for the "sci fly" demo example, if you adjust line 27 of that source file to: layer = map.createLayer(0, undefined, undefined, undefined, true);
The new terminal "true" parameter instructs Phaser.Tilemap.createLayer to create a TilemapLayerGL object instead of the usual Phaser.TilemapLayer.

Author: pjbaron