message: Used move style over mounted style during transitioning
  Otherwise, transitioning at end of gesture move meant scene returned
  briefly to mounted style before transitioning away
diff: @@ -70,7 +70,7 @@ class SceneNavigator extends React.Component<any, any> {
  styles={sceneContexts.map(({state, data, url}) => ({
  key: url,
  data: {scene: this.state.scenes[url], state, data, url, mount: url === nextCrumb.url},
  - style: getStyle(mountedStyle, state, data, spring(0))
  + style: getStyle(this.state.scenes[url].style || mountedStyle, state, data, spring(0))
  }))}>
  {tweenStyles => (
  <View style={style}>
  