extra DOM events for DataTable (#1723)

* extra DOM events for DataTable

- support for ‘row-click’ DOM event (bubbling)
- support for ‘row-dblclick’ DOM event (bubbling)
- DataRowEvent exposes ‘sender’ property to simplify access to
component from within handlers
- readme and test updates

* fix unit tests

demo-shell-ng2/app/components/datatable/datatable-demo.component.html

@@ -4,7 +4,9 @@
         [multiselect]="multiselect"
         [actions]="true"
         (showRowActionsMenu)="onShowRowActionsMenu($event)"
-        (executeRowAction)="onExecuteRowAction($event)">
+        (executeRowAction)="onExecuteRowAction($event)"
+        (row-click)="onRowClick($event)"
+        (row-dblclick)="onRowDblClick($event)">
       <!-- HTML column definition demo -->
         <!--
         <data-columns>