message: Passed previous scene data into render scene
  Allows one scene to pass non navigation data to another. Plan to use to
  pass component ref from grid to details so the details scene can
  measure the color coordinates on change of orientation
diff: @@ -8,9 +8,12 @@ class NavigationMotion extends React.Component<any, any> {
  private onNavigate = (oldState, state, data, asyncData) => {
  this.setState((prevState) => {
  var {url, crumbs} = this.getStateNavigator().stateContext;
  - var scenes = {[url]: {element: state.renderScene(data, this.moveScene(url), asyncData)}};
  + var scenes = {};
  + var previousScene = null;
  for(var i = 0; i < crumbs.length; i++)
  - scenes[crumbs[i].url] = prevState.scenes[crumbs[i].url];
  + scenes[crumbs[i].url] = previousScene = prevState.scenes[crumbs[i].url];
  + var previousSceneData = previousScene && previousScene.data;
  + scenes[url] = {element: state.renderScene(data, this.moveScene(url), previousSceneData)};
  return {scenes};
  });
  }
  