Add apireftable ID for table element

Signed-off-by: Pekka Helenius <fincer89@hotmail.com>

bookstore/src/main/resources/templates/apiref.html

@@ -26,7 +26,7 @@ adminUser = 'admin:admin'
 	page.text.apiref.warning.a
 	</p>
 */-->
-	<table class="table table-striped">
+	<table id="apireftable" class="table table-striped">
 		<tbody>
 			<!--/* START: endpoints ------------------------------  */-->
 			<tr>