code: function VisitorStream (qlobber)
  {
      stream.Readable.call(this, { objectMode: true });
      this._iterator = qlobber.visit();
  }
docs: Creates a new [`Readable`](https://nodejs.org/dist/latest-v8.x/docs/api/stream.html#stream_class_stream_readable) stream, in object mode, which calls [`visit`](#qlobberprototypevisit) on a qlobber to generate its data.
  
  You could [`pipe`](https://nodejs.org/dist/latest-v8.x/docs/api/stream.html#stream_readable_pipe_destination_options) this to a [`JSONStream.stringify`](https://github.com/dominictarr/JSONStream#jsonstreamstringifyopen-sep-close) stream, for instance, to serialize the qlobber to JSON. See [this test](test/json.js#L14) for an example.
  
  Inherits from [`Readable`](https://nodejs.org/dist/latest-v8.x/docs/api/stream.html#stream_class_stream_readable).
  
  @constructor
  
  @param {Qlobber} qlobber The qlobber to call [`visit`](#qlobberprototypevisit) on.