code: function RosterProxy(options) {
      this.service = options.service;
      this.helpers = options.helpers;
      this.connection = options.stropheClient;
      this.Client = options.xmppClient;
      this.nodeStanzasCallbacks = options.nodeStanzasCallbacks;
      //
      this.contacts = {};
  }
docs: /* Chat module: Roster
  
  Integration of Roster Items and Presence Subscriptions
  http://xmpp.org/rfcs/rfc3921.html#int
  default - Mutual Subscription
  
  ----------------------------------------------------------------------------- 
  @namespace QB.chat.roster