Add support for multiple keys as proposed in #544

Author: mevdschee

tests/config/base.php

@@ -9,7 +9,7 @@
     'dbAuth.returnedColumns' => 'id,username,password',
     'jwtAuth.mode' => 'optional',
     'jwtAuth.time' => '1538207605',
-    'jwtAuth.secret' => 'axpIrCGNGqxzx2R9dtXLIPUSqPo778uhb8CA0F4Hx',
+    'jwtAuth.secrets' => 'axpIrCGNGqxzx2R9dtXLIPUSqPo778uhb8CA0F4Hx',
     'basicAuth.mode' => 'optional',
     'basicAuth.passwordFile' => __DIR__ . DIRECTORY_SEPARATOR . '.htpasswd',
     'reconnect.databaseHandler' => function () {