code: function expose(anchor, name, message) {
    Object.defineProperty(errors[anchor], name, {
      enumerable: true,
      get: function() {
        var err = new Error();
  
        err.name = capitalize(anchor) + 'Error';
        err.message = message;
        Error.captureStackTrace(err, arguments.callee);
        return err;
      }
    });
  }
docs: Helper function for exposing errors,
  also edits the stack trace to remove itself.
  
  @param {Object} anchor
  @param {String} name
  @param {String} message