code: function restifyHandler(handler, req, res, next) {
          Promise.method(handler).call(this, req, res)
              .then(function(result) {
                  next(result);
              })
              .catch(function(error) {
                  //FIXME ensure error is an error instance.
                  next(error);
              });
      }
docs: The `restifyHandler` will be registered with the restify server, after partially applying the `handler` arg.