code: function(service, credentials, accounts, keywords) {
    Stream.call(this, service, credentials, accounts, keywords);
    
    // Set up instagram-node-lib
    Insta.set('client_id',     credentials.client_id);
    Insta.set('client_secret', credentials.client_secret);
      
    // Set api endpoint URL for subscriber
    this.api_endpoint = 'https://api.instagram.com/v1/subscriptions/';
    
    // Initialize subscriber object
    this.subscriber = new Subscriber(credentials, this.callback_url(), this.api_endpoint);
      
    // Initialize responder
    this.responder = new Responder();
    
    // Start listening for incoming
    process.nextTick(function() {
        this.delegateResponder();
      }.bind(this));
    
  }
docs: Manages the streaming connection to Instagram
  @constructor
  @extends Stream