Pass previous route details like title as props #371
Description
I don't know if version 3.x passes the previous route details to the new route as props but 2.x doesn't.
When using NavigatorIOS the back button shows the title of the previous Screen | Route and it will be more efficient to programmatically get few details of the previous route passed as props to the current Screen | Route. Minimal details like the title should be passed with the route props passed down
