Trying to have consistent three.js console messages formatting.

src/core/Object3D.js

@@ -114,7 +114,7 @@ THREE.Object3D.prototype = {
 
 		if ( object === this ) {
 
-			console.warn( 'THREE: Object3D.add(): An object can\'t be added as a child of itself.' );
+			console.warn( 'THREE.Object3D.add: An object can\'t be added as a child of itself.' );
 			return;
 
 		}