message: Forced update for in-flight navigation
  In the code splitting example, there's a navigation in-flight before the getNavigationContinuation override is applied. Need to force an update when the navigation completes an the old continuation fires. Remove the listener as soon as the getNavigationContinuation override kicks in
diff: @@ -3,17 +3,20 @@ import { StateNavigator, State } from 'navigation';
  import * as React from 'react';
  class NavigationHandler extends React.Component<{ stateNavigator: StateNavigator }, { stateNavigator: StateNavigator }> {
  + private navigateHandler: any;
  constructor(props) {
  super(props);
  var { stateNavigator } = props;
  + this.navigateHandler = (() => this.forceUpdate()).bind(this);
  + stateNavigator.onNavigate(this.navigateHandler);
  stateNavigator.getNavigateContinuation = this.getNavigateContinuation.bind(this);
  this.state = { stateNavigator };
  }
  private getNavigateContinuation(oldUrl: string, state: State, data: any, url: string, historyAction: 'add' | 'replace' | 'none', history: boolean): () => void {
  + var { stateNavigator } = this.props;
  return (asyncData?: any) => {
  this.setState(() => {
  - var { stateNavigator } = this.props;
  if (oldUrl === stateNavigator.stateContext.url) {
  stateNavigator.historyManager.init = () => {};
  var nextNavigator: StateNavigator = stateNavigator.clone(stateNavigator.historyManager);
  @@ -26,8 +29,9 @@ class NavigationHandler extends React.Component<{ stateNavigator: StateNavigator
  }
  return null;
  }, () => {
  - this.props.stateNavigator.stateContext = this.state.stateNavigator.stateContext;
  - this.props.stateNavigator.notify(historyAction);
  + stateNavigator.stateContext = this.state.stateNavigator.stateContext;
  + stateNavigator.offNavigate(this.navigateHandler);
  + stateNavigator.notify(historyAction);
  });
  };
  }
  