bug

Warning displayed in console about internal error of React performance measurement code.

``` js
import React from 'react';
import { render } from 'react-dom';
import Perf from 'react-addons-perf';
import { browserHistory, Router } from 'react-router';

import routes from './routes';
import persist from 'altFlux/persist';

persist('docs');

const target = document.getElementById('app');

Perf.start();

render(
  <Router
    routes={routes}
    history={browserHistory}
  />,
  target,
  () => {
    Perf.stop();
    Perf.printWasted();
  }
);
```

![screen shot 2016-05-23 at 9 21 08 am](https://cloud.githubusercontent.com/assets/91464/15472297/5e440d48-20c8-11e6-99d7-363f6d1bdcce.png)

15.1.0
Google Chrome

checkDebugID(debugID);
    if (__DEV__) {
      if (isProfiling && currentFlushNesting > 0) {
        warning(
          currentTimerType === timerType,
          'There is an internal error in the React performance measurement code. ' +
          'We did not expect %s timer to stop while %s timer is still in ' +
          'progress for %s instance. Please report this as a bug in React.',
          timerType,
          currentTimerType || 'no',
          (debugID === currentTimerDebugID) ? 'the same' : 'another'
        );
        currentFlushMeasurements.push({
          timerType,
          instanceID: debugID,
          duration: performanceNow() - currentTimerStartTime,
        });
        currentTimerStartTime = null;
        currentTimerDebugID = null;
        currentTimerType = null;
      }
    }
    emitEvent('onEndLifeCycleTimer', debugID, timerType);
  },
  onBeginReconcilerTimer(debugID, timerType) {