Fix DataSet Moment conversion. Calling object.clone() will fail if

object is already a moment instance. Calling moment(object) will clone
it per tehe moment docs http://momentjs.com/docs/#/parsing/moment-clone/

src/util.js

@@ -171,7 +171,7 @@ util.convert = function convert(object, type) {
                 return moment(object.valueOf());
             }
             else if (moment.isMoment(object)) {
-                return moment.clone();
+                return moment(moment);
             }
             if (util.isString(object)) {
                 match = ASPDateRegex.exec(object);