* Update Stacks{In,Over}Tabs example for better clarity
* Remove redundant navigationOptions in stack examples
* Update text in ReduxExample to clarify which route is being used
* [Example] Fix the ReduxExample app
Just a bit of cleanup so it can run.
* [Example] Remove AsyncStorage persistence from ReduxExample
It's a cool feature, but isn't necessary to demonstrate how to use
react-navigation and may cause more confusion than it's worth.
