added ENV variable for the auth roles delimiter

Author: tkolzer

config/app.php

@@ -196,6 +196,6 @@
     'auth_roles_header' =>  env('AUTH_ROLES_HEADER', 'remote-groups'),
     'auth_roles_http_header' =>  env('AUTH_ROLES_HTTP_HEADER', 'HTTP_REMOTE_GROUPS'),
     'auth_roles_admin' =>  env('AUTH_ROLES_ADMIN', 'admin'),
-    'auth_roles_delimiter' =>  ',',
+    'auth_roles_delimiter' =>  env('AUTH_ROLES_DELIMITER', ','),
 
 ];