code clean up for default reminder email and added flag to disable registration on front end.

appsettings.json

@@ -11,6 +11,7 @@
   "UseMPG": true,
   "UseDescending": false,
   "EnableAuth": false,
+  "DisableRegistration":  false,
   "HideZero": false,
   "EnableAutoReminderRefresh": false,
   "EnableAutoOdometerInsert": false,
@@ -27,5 +28,6 @@
   "VisibleTabs": [ 0, 1, 4, 2, 3, 6, 5, 8 ],
   "DefaultTab": 8,
   "UserNameHash": "",
-  "UserPasswordHash": ""
+  "UserPasswordHash": "",
+  "DefaultReminderEmail":  ""
 }