Adrien Brault 7fdabd8f14 Navigator: emit didFocus after routeStack reset
Summary:Hi,

I am using https://github.com/aksonov/react-native-router-flux / https://github.com/exponentjs/ex-navigator and I needed a way to update my redux store with the current route.

I'm using the navigation context to do this:

```javascript
if (navigationContext) {
  const handler = () => {
    updateCurrentRouteState(navigationContext.currentRoute);
  };
  navigationContext.addListener('willfocus', handler);
  navigationContext.addListener('didfocus', handler);
}
```

However, when the whole stack is replaced, no event is emitted. This PR aims to fix that.
Closes https://github.com/facebook/react-native/pull/5596

Differential Revision: D3080004

Pulled By: ericvicenti

fb-gh-sync-id: 0ef4ecebec7076275b6433c80aae6102cf28c039
shipit-source-id: 0ef4ecebec7076275b6433c80aae6102cf28c039
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