Allow to specify fallbackEmail during user creation

src/js/client.js

@@ -1767,6 +1767,7 @@ angular.module('Application').service('Client', ['$http', '$interval', '$timeout
     Client.prototype.addUser = function (user, callback) {
         var data = {
             email: user.email,
+            fallbackEmail: user.fallbackEmail,
             displayName: user.displayName,
             role: user.role
         };