code: function deleteScope(scope){
      var key, handlers, i;
  
      for (key in _handlers) {
        handlers = _handlers[key];
        for (i = 0; i < handlers.length; ) {
          if (handlers[i].scope === scope) handlers.splice(i, 1);
          else i++;
        }
      }
    }
docs: delete all handlers for a given scope