code: function uuids (count, callback) {
      if (typeof count === 'function') {
        callback = count
        count = 1
      }
      return relax({ method: 'GET', path: '_uuids', qs: { count: count } }, callback)
    }
docs: http://docs.couchdb.org/en/latest/api/server/common.html#uuids