Change default token to empty string instead of undefined

fixes #329

ui/javascripts/app/controllers.js

@@ -501,6 +501,7 @@ App.SettingsController = Ember.ObjectController.extend({
       if (window.confirm("Are your sure you want to reset your settings?")) {
         localStorage.clear();
         controller.set('content', App.Settings.create());
+        App.set('settings.token', '');
         notify('Settings reset', 3000);
         this.set('isLoading', false);
       }

ui/javascripts/app/router.js

@@ -8,6 +8,7 @@ Ember.Application.initializer({
 
   initialize: function(container, application) {
     application.set('settings', App.Settings.create());
+    App.set('settings.token', '');
   }
 });