Slit component in analitycs-param-report

Improve the form validation
Fix the reset reports on change params

ng2-components/ng2-activiti-analytics/src/components/widgets/date-range/date-range.widget.ts

@@ -144,4 +144,8 @@ export class DateRangeWidget extends WidgetComponent {
     public convertMomentDate(date: string) {
         return moment(date, DateRangeWidget.FORMAT_DATE_ACTIVITI, true).format(DateRangeWidget.FORMAT_DATE_ACTIVITI) + 'T00:00:00.000Z';
     }
+
+    ngOnDestroy() {
+
+    }
 }