Missing redux hot reload snippet

It seems by the look of it that the code to make Hot Module Reload with redux is missing.

See examples here: https://github.com/erikras/react-redux-universal-hot-example/blob/master/src/redux/create.js#L28-L32

and here: https://facebook.github.io/react-native/blog/2016/03/24/introducing-hot-reloading.html#redux-stores

@jevakallio do you think this code in `store.js` will work?

```
import reducer from './reducer';
if (__DEV__ && module.hot) {
module.hot.accept(() => {
store.replaceReducer(reducer);
});
}
```

Start by inspecting store.js and compare its Redux hot-reload setup with the two referenced examples. Verify whether accepting the module update replaces the Redux reducer while preserving the store, and confirm that the resulting behavior works during development.

Written by the indexing model from the issue text.