public HttpResponseMessage PutPermissoes(Permissao permissao)
        {
            if (permissao == null) return Request.CreateResponse(HttpStatusCode.BadRequest);

            try
            {
                db.Entry<Permissao>(permissao).State = System.Data.Entity.EntityState.Modified;
                db.SaveChanges();

                var result = permissao;
                return Request.CreateResponse(HttpStatusCode.OK, result);
            }
            catch (Exception)
            {
                return Request.CreateResponse(HttpStatusCode.InternalServerError, "Falha ao alterar Permissão.");
            }
        }
        public HttpResponseMessage PostPermissoes(Permissao permissao)
        {
            if (permissao == null) return Request.CreateResponse(HttpStatusCode.BadRequest);

            try
            {
                db.Permissoes.Add(permissao);
                db.SaveChanges();

                var result = permissao;
                return Request.CreateResponse(HttpStatusCode.Created, result);
            }
            catch (Exception)
            {
                return Request.CreateResponse(HttpStatusCode.InternalServerError, "Falha ao inserir Permissão.");
            }
        }