message: Tidied up imports
diff: -import { State, Crumb } from 'navigation';
  -import { NavigationEvent } from 'navigation-react';
  import * as React from 'react';
  +import { State, Crumb } from 'navigation';
  import Motion from './Motion';
  import SceneProxy from './SceneProxy';
  import SharedElementContext from './SharedElementContext';
  