docs: function MongoStorageRelyQ(redis, opts) {
    // handle forgetting a 'new'
    if (!(this instanceof MongoStorageRelyQ)) {
      return new MongoStorageRelyQ(redis, opts);
    }
    Q.call(this, redis, opts);
  
    this._mongo = this._options.mongo.db(this._options.db || 'test').collection(this._options.collection || 'relyq');
  }