Loaders: Ensure consistent ctor of CompressedTextureLoaders.

examples/js/loaders/DDSLoader.js

@@ -2,7 +2,9 @@
  * @author mrdoob / http://mrdoob.com/
  */
 
-THREE.DDSLoader = function () {
+THREE.DDSLoader = function ( manager ) {
+
+	THREE.CompressedTextureLoader.call( this, manager );
 
 	this._parser = THREE.DDSLoader.parse;
 

examples/js/loaders/KTXLoader.js

@@ -8,7 +8,9 @@
  */
 
 
-THREE.KTXLoader = function () {
+THREE.KTXLoader = function ( manager ) {
+
+	THREE.CompressedTextureLoader.call( this, manager );
 
 	this._parser = THREE.KTXLoader.parse;
 

examples/js/loaders/PVRLoader.js

@@ -10,7 +10,7 @@
 
 THREE.PVRLoader = function ( manager ) {
 
-	this.manager = ( manager !== undefined ) ? manager : THREE.DefaultLoadingManager;
+	THREE.CompressedTextureLoader.call( this, manager );
 
 	this._parser = THREE.PVRLoader.parse;