message: Removed redundant main activity reset
  Think not needed now that always start a new SceneActivity. This kills off any stray Activities
diff: @@ -103,12 +103,6 @@ public class NavigationStackView extends ViewGroup {
  @Override
  public void onDetachedFromWindow() {
  - /*Activity currentActivity = ((ThemedReactContext) getContext()).getCurrentActivity();
  - if (keys.size() > 0 && currentActivity != null) {
  - Intent mainIntent = mainActivity.getIntent();
  - mainIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
  - currentActivity.navigateUpTo(mainIntent);
  - }*/
  scenes.clear();
  super.onDetachedFromWindow();
  }
  