code: function range(from, to) {
    return {
      from: format(from, true),
      to: format(to, true)
    };
  }
docs: ## Create from/to range  Creates a from/to range which can be used with `querystring`.  Both `from` and `to` should be Date instances. Returns an object with string properties `from`/`to` in the format `YYYYMMDD`.  Usage:  > dates.range(new Date('2014-01-01'), new Date('2014-01-05')); { from: '20140101', to: '20140105' }