lib/redis.js
function() {
    var multi = this._client.multi();
    multi.execAsync = Promise.promisify(multi.exec);
    return multi;
  }
function() {
    var multi = this._client.multi();
    multi.execAsync = Promise.promisify(multi.exec);
    return multi;
  }
Get a redis multi interface
@returns {Object} Redis multi interface