message: Shared stack across tabs
  Dropped TabBarItem for now because wasn't doing anything and probably gonna wrap it around stack. TabBar takes tab titles from first screen title anyway
diff: @@ -26,23 +26,19 @@ var notificationsNavigator = new StateNavigator(stateNavigator);
  stateNavigator.navigate('home');
  notificationsNavigator.navigate('notifications');
  -export default () => (
  - <TabBarIOS style={{flex: 1}}>
  +var Stack = ({stateNavigator}) => (
  <NavigationHandler stateNavigator={stateNavigator}>
  <NavigationStack
  title={({getTitle, title}, data) => getTitle ? getTitle(data) : title}
  crumbStyle={from => from ? 'scale_in' : 'scale_out'}
  unmountStyle={from => from ? 'scale_in' : 'scale_out'}>
  - <TabBarItemIOS title="Home" />
  - </NavigationStack>
  - </NavigationHandler>
  - <NavigationHandler stateNavigator={notificationsNavigator}>
  - <NavigationStack
  - title={({getTitle, title}, data) => getTitle ? getTitle(data) : title}
  - crumbStyle={from => from ? 'scale_in' : 'scale_out'}
  - unmountStyle={from => from ? 'scale_in' : 'scale_out'}>
  - <TabBarItemIOS title="Notifications" />
  </NavigationStack>
  </NavigationHandler>
  +);
  +
  +export default () => (
  + <TabBarIOS style={{flex: 1}}>
  + <Stack stateNavigator={stateNavigator} />
  + <Stack stateNavigator={notificationsNavigator} />
  </TabBarIOS>
  );
  