code: function Paginator(options) {
    debug('initializing from <%s>', __filename);
    this.options = options || {};
    this.footer = this.options.footer;
    if (typeof this.footer !== 'string') {
      this.footer = '(Move up and down to reveal more choices)';
    }
    this.firstRender = true;
    this.lastIndex = 0;
    this.position = 0;
  }
docs: The paginator keeps track of a position index in a list
  and returns a subset of the choices if the list is too
  long.