message: Defaulted to fade when sharing elements
  Mimics Activity behaviour
diff: @@ -39,8 +39,10 @@ class FragmentNavigator extends SceneNavigator {
  for(Pair<View, String> sharedElement : sharedElements) {
  fragmentTransaction.addSharedElement(sharedElement.first, sharedElement.second);
  }
  - }
  + fragmentTransaction.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
  + } else {
  fragmentTransaction.setCustomAnimations(oldCrumb != -1 ? enter : 0, exit, popEnter, popExit);
  + }
  SceneFragment fragment = new SceneFragment(scene, getSharedElementSet(stack.sharedElementNames));
  fragmentTransaction.replace(stack.getChildAt(0).getId(), fragment, key);
  fragmentTransaction.addToBackStack(String.valueOf(nextCrumb));
  