public IHttpActionResult PutRole(long id, Role role)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            if (id != role.Id)
            {
                return BadRequest();
            }

            db.Entry(role).State = System.Data.Entity.EntityState.Modified;

            try
            {
                db.SaveChanges();
            }
            catch (DbUpdateConcurrencyException)
            {
                if (!RoleExists(id))
                {
                    return NotFound();
                }
                else
                {
                    throw;
                }
            }

            return StatusCode(HttpStatusCode.NoContent);
        }
        public IHttpActionResult PostRole(Role role)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }
            db.Configuration.ProxyCreationEnabled = false;
            db.Roles.Add(role);
            db.SaveChanges();

            return CreatedAtRoute("DefaultApi", new { id = role.Id }, role);
        }