code: function() {
  
          if (purging) {
              return;
          }
  
          purging = true;
          for (var i in queues) {
              var q = queues[i];
              if (q.autopurge && q.finished) {
                  _purge(q.tId);
                  delete queues[i];
              }
          }
  
          purging = false;
      }
docs: Removes processed queues and corresponding nodes
  @method _autoPurge
  @private