code: function getAppsLists (callback) {
    return this.steam('getAppList').then(function (body) {
      var lists = Object.create(null);
      body.applist.apps.forEach(function (app) {
        var type = this.match(app.appid);
        if (!lists[type]) {
          lists[type] = [];
        }
        lists[type].push(app);
      }, this);
      return Promise.resolve(lists);
    }.bind(this)).nodeify(callback);
  }
docs: [getAppsLists description]
  
  @return {[type]} [description]