function listeners(type) {
      var object = this,
          events = object.events || (object.events = {});

      return _.has(events, type) ? events[type] : (events[type] = []);
    }
Returns an array of event listeners for a given type that can be manipulated
to add or remove listeners.

@memberOf Benchmark, Benchmark.Suite
@param {string} type The event type.
@returns {Array} The listeners array.