public IHttpActionResult CreateRole(NewRole newRole)
        {
            if (newRole == null)
            {
                throw new ArgumentNullException("newRole");
            }
            if (string.IsNullOrWhiteSpace(newRole.Name))
            {
                throw new ArgumentException("Role name must be defined.");
            }

            Role role = mapperFactory.CreateRoleMapper().Map(identityManagementService.CreateRole(newRole.Name, newRole.Description, newRole.ExternalGroupName));

            return Ok(role);
        }