[ADF-1039] Search results highlighting (#2080)

* Provide a way to highlight the searched word

* Add unit test

ng2-components/ng2-alfresco-search/src/components/alfresco-search-control.component.ts

@@ -41,6 +41,9 @@ export class AlfrescoSearchControlComponent implements OnInit, OnDestroy {
     @Input()
     expandable: boolean = true;
 
+    @Input()
+    highlight: boolean = false;
+
     @Output()
     searchChange = new EventEmitter();