Update CubeGeometry.js

warning the user

src/extras/geometries/CubeGeometry.js

@@ -1,3 +1,6 @@
 // DEPRECATED
 
-THREE.CubeGeometry = THREE.BoxGeometry;
+THREE.CubeGeometry = function(){
+	console.warn( 'DEPRECATED: THREE.CubeGeometry is deprecated. Use THREE.BoxGeometry instead.' );
+	return new THREE.BoxGeometry();
+};