code: function clone() {
           var copy = [];
           this.points.forEach(function (point) {
             copy.push(point.clone());
           });
           return new me.Polygon(this.pos.x, this.pos.y, copy);
         }
docs: clone this Polygon
  @name clone
  @memberOf me.Polygon.prototype
  @function
  @return {me.Polygon} new Polygon