Migrating from 2.x

Breaking changes comparing with 2.x version:

React Native 0.26 is required
Router is root container now and should not be nested. For nested scenes you should use Scene element
Route became Scene, now unique key attribute is required for each scene (it was name attribute before)
Define all your scenes on top-level, not within Router as before (see Example)
No Schema element is supported for now (for simplicity), maybe later it could be added
No ActionSheet support
Custom scene renderers are used instead of 'custom' types (like 'modal'), so 'modal' scenes are pushed as usual, but custom renderer will render them as popup. No dismiss, just usual pop to close such popups.
No old navigator.sceneConfig support (instead the component uses React Native NavigationAnimatedView for better transitions)
No onPush/onPop/etc handlers because they are not needed now. If navigation state is changed, container will be re-rendered with changed navigationState property, see Modal as Example.
No header/footer properties are supported for Scene currently - you may include them into Scene component.