James Ide 2c7de35dee Export per-platform NavigatorNavigationBarStyles for consistent styling
Summary: This allows for the iOS-style navigation bar on Android and vice versa in order to simplify design. It is entirely optional in that NavigationBars will continue to defauly to their platform-specific style, but you can override it with the `navigationStyles` prop:

```js
<Navigator.NavigationBar
  navigationStyles={Navigator.NavigationBar.StylesIOS}
/>
```

Fixes #2995.
Closes https://github.com/facebook/react-native/pull/3028

Reviewed By: @​svcscm

Differential Revision: D2527902

Pulled By: @ericvicenti

fb-gh-sync-id: c7b1bfac200b5e03fc0d9dfb8acc8b916c825595
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