Merge pull request #903 from massanho/fix-jshint

fix errors reported by jshint

Sortable.js

@@ -27,7 +27,7 @@
 	if (typeof window == "undefined" || typeof window.document == "undefined") {
 		return function () {
 			throw new Error("Sortable.js requires a window with a document");
-		}
+		};
 	}
 
 	var dragEl,
@@ -803,6 +803,7 @@
 					}
 
 					if (Sortable.active) {
+						/* jshint eqnull:true */
 						if (newIndex == null || newIndex === -1) {
 							newIndex = oldIndex;
 						}