Added dummy setClearColor to CSS3DRenderer.

examples/js/renderers/CSS3DRenderer.js

@@ -72,6 +72,10 @@ THREE.CSS3DRenderer = function () {
 
 	domElement.appendChild( cameraElement );
 
+	this.setClearColor = function () {
+
+	};
+
 	this.setSize = function ( width, height ) {
 
 		_width = width;