* [ReduxExample] Programmatically generate initial state
* [ReduxExample] Return original state if nextState is null
* [Docs] Add getStateForAction to redux integration example
* [Docs] Add link to ReduxExample app
* [Docs] Give each example a 'DRY' README linking to real docs
* [Docs] Clean up the Contributors guide a bit
* [Docs] Remove numbers from sections in Contributors guide
They don't seem very meaningful, and don't need to be done in order
* add import to clarify source of helper
It took me a while to figure out where 'addNavigationHelpers' comes from, maybe adding the import in the doc here will help the next guy.
* add spaces around imported value
* removed empty line
When the drawer opens / close, the result of AppNavigator.router.getStateForAction(action, state); is null. So the nav state in the store is null which causes errors. This solves that.
