return promise from auth

js/controllers/signInController.js

@@ -87,7 +87,7 @@ app.controller('SignInController', [
   vm.auth = function () {
     var subject = vm.currentSubject;
     var issuer = vm.issuerName;
-    vm.oauth3.authenticate({
+    return vm.oauth3.authenticate({
       subject: subject
     , scope: [ 'domains@oauth3.org', 'domains', 'dns@oauth3.org', 'dns', 'www@daplie.com' ]
     }).then(function (session) {