Updated security expressions #148 (#166)

* replace has_role() with is_granted()
* added basic integration test classes for main controller
* added basic integration test classes for admin controller

src/Controller/InvoiceController.php

@@ -27,7 +27,7 @@ use Symfony\Component\HttpFoundation\Request;
  * Controller used to manage invoices.
  *
  * @Route("/invoice")
- * @Security("has_role('ROLE_TEAMLEAD')")
+ * @Security("is_granted('ROLE_TEAMLEAD')")
  */
 class InvoiceController extends AbstractController
 {