public IHttpActionResult CreateUser(NewUser newUser)
        {
            if (newUser == null)
            {
                throw new ArgumentNullException("newUser");
            }
            if (string.IsNullOrWhiteSpace(newUser.Name))
            {
                throw new ArgumentException("User name must be defined.");
            }

            UserListItem userListItem = mapperFactory.CreateUserListItemMapper().Map(identityManagementService.CreateUser(newUser.Name));

            return Ok(userListItem);
        }