* fixes setImmediate

Sortable.js

@@ -1249,7 +1249,10 @@
 			var postMessageIsAsynchronous = true;
 			var oldOnMessage = win.onmessage;
 
-            win.onmessage = function () { postMessageIsAsynchronous = false; };
+			win.onmessage = function () {
+				postMessageIsAsynchronous = false;
+			};
+
 			win.postMessage('', '*');
 			win.onmessage = oldOnMessage;
 
@@ -1273,7 +1276,6 @@
 				setImmediate = function (callback) {
 					postMessageQueue.push(callback);
 					win.postMessage(postMessageEventName, '*');
-					return handle;
 				};
 			}
 		}