message: Removed stateNavigator prop
  Accessed from navigationEvent
diff: @@ -10,8 +10,8 @@ class Scene extends React.Component {
  crumb: 0
  }
  static getDerivedStateFromProps(props) {
  - var {crumb, navigationEvent, stateNavigator} = props;
  - var {state, crumbs} = stateNavigator.stateContext;
  + var {crumb, navigationEvent} = props;
  + var {state, crumbs} = navigationEvent.stateNavigator.stateContext;
  return (state && crumbs.length === crumb) ? {navigationEvent} : null;
  }
  render() {
  @@ -28,6 +28,6 @@ class Scene extends React.Component {
  export default props => (
  <NavigationContext.Consumer>
  - {(navigationEvent) => <Scene stateNavigator={navigationEvent.stateNavigator} navigationEvent={navigationEvent} {...props} />}
  + {(navigationEvent) => <Scene navigationEvent={navigationEvent} {...props} />}
  </NavigationContext.Consumer>
  )
  