Merge pull request #14 from scttnlsn/master

Add CommonJS support

Sortable.js

@@ -11,6 +11,9 @@
 	if( typeof define === "function" && define.amd ){
 		define(factory);
 	}
+	else if( typeof module != "undefined" && typeof module.exports != "undefined" ){
+		module.exports = factory();
+	}
 	else {
 		window["Sortable"] = factory();
 	}