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.ts

@@ -154,4 +154,12 @@ export class DataTableDemoComponent {
         console.log(args.action);
         window.alert(`My custom action: ${args.action.title}`);
     }
+
+    onRowClick(event) {
+        console.log(event);
+    }
+
+    onRowDblClick(event) {
+        console.log(event);
+    }
 }