code: function wait(callback) {
  
    return pipeline.obj(
      waitObj(),
      through.obj(function (chunk, enc, next) {
        next(null, Buffer.concat(chunk.map(function (item) {
          return new Buffer(item, enc);
        })));
      }),
      throughWithCallback(callback)
    );
  }
docs: Creates a new stream with a single value that's a Buffer of the entire
  contents of the stream.
  
  @static
  @since    1.0.0
  @category Consumers
  
  @param    {Function} callback - A function to be called with the contents
  of the stream. This is a convenience to
  avoid listening to the data/end events of
  the stream.
  @returns  {Stream.Transform}  - Transform stream.
  
  @example
  
  // get the entire contents of a file
  fs.createReadStream('example.txt')
  .pipe(nodeStream.wait());
  // => Buffer