code: function MongoDriver(config) {
      this.config = config;
      this.db = null;
      this.pending = false;
      this.ObjectId = mongoSkin.ObjectID;
  }
docs: /* CLASS MongoDriver
  
  {
  name : ""
  prefix : ""
  servers : [{host : "", port : ""} ...]
  credentials : {username : "", password : ""}
  URLParam : { }
  extraParam : {db : {}, server : {}, replSet : {}, mongos: {}}
  }
  
  REF: http://mongodb.github.io/node-mongodb-native/driver-articles/mongoclient.html#mongoclient-connect