function removeAllListeners(type) {
    var me = this,
        events = me.events;

    forEach(type ? type.split(' ') : events, function(type) {
      (events && events[type] || []).length = 0;
    });
    return me;
  }
Unregisters all listeners or those for the specified event type(s).
@memberOf Benchmark, Benchmark.Suite
@param {String} type The event type.
@returns {Object} The benchmark instance.
@example

// unregister all listeners
bench.removeAllListeners();

// unregister all listeners for an event type
bench.removeAllListeners('cycle');

// unregister all listeners for multiple event types
bench.removeAllListeners('start cycle complete');