Optimize sending data from worker

When transferable list is specified, postingMessage to worker doesn't copy data.
Since ctm.js references original data, we can specify original stream to be transferred back to the main thread.

examples/js/loaders/ctm/CTMWorker.js

@@ -9,7 +9,7 @@ self.onmessage = function( event ) {
 		var stream = new CTM.Stream( event.data.data );
 		stream.offset = event.data.offsets[ i ];
 
-		files[ i ] = new CTM.File( stream );
+		files[ i ] = new CTM.File( stream, [event.data.data.buffer] );
 
 	}