Cleanup, prepping for example game stuff

assets/scenes/cube.js

@@ -1,4 +1,4 @@
-var Cube = include('entities/cube.js');
+var CubeEntity = include('entities/CubeEntity.js');
 
 function CubeScene() {
   this.cam = new Entity();
@@ -8,7 +8,7 @@ function CubeScene() {
   this.cam.position.position = new Vec3(3, 3, 3);
   this.cam.position.lookAt(new Vec3(0, 0, 0));
 
-  this.cube = new Cube();
+  this.cube = new CubeEntity();
 }
 
 CubeScene.prototype = Object.create(Scene.prototype);