Cleanup, prepping for example game stuff

assets/entities/CubeEntity.js

@@ -0,0 +1,22 @@
+var OverworldEntity = include('entities/OverworldEntity.js');
+
+function CubeEntity() {
+  OverworldEntity.call(this);
+
+  this.add(MESH);
+  this.add(MATERIAL);
+}
+
+CubeEntity.prototype = Object.create(OverworldEntity.prototype);
+CubeEntity.prototype.constructor = CubeEntity;
+
+CubeEntity.prototype.update = function() {
+  OverworldEntity.prototype.update.call(this);
+  var speed = 3.0;
+  var move = Input.axis2D(INPUT_ACTION_LEFT, INPUT_ACTION_RIGHT, INPUT_ACTION_UP, INPUT_ACTION_DOWN);
+  this.position.position.x += move.x * speed * TIME.delta;
+  this.position.position.z += move.y * speed * TIME.delta;
+  this.material.setColor(Color.rainbow());
+};
+
+module = CubeEntity;