Use Notification/Notifiable (#379)

* Add migrations for notifiables

* Configure spatie-backup to run as part of cron

* Convert Mailer to Notification; add pirep notifications

* Styling

resources/stubs/installer/config.stub

@@ -99,7 +99,7 @@ return [
         'port' => 587,
         'from' => [
             'name' => '',
-            'address' => '',
+            'address' => 'no-reply@phpvms.net',
         ],
         'username' => '',
         'password' => '',