message: Don't include domain prop as extra property on Error objects
diff: @@ -31,7 +31,7 @@ module.exports.parseError = function parseError(err, kwargs, cb) {
  var extraErrorProps;
  for (var key in err) {
  if (err.hasOwnProperty(key)) {
  - if (key !== 'name' && key !== 'message' && key !== 'stack') {
  + if (key !== 'name' && key !== 'message' && key !== 'stack' && key !== 'domain') {
  extraErrorProps = extraErrorProps || {};
  extraErrorProps[key] = err[key];
  }
  