message: Removed replacing scene
  Scene's are pegged to Activities now that always navigate back to the current Activity. So don't need to replace on new intent anymore
diff: @@ -57,15 +57,6 @@ public class SceneActivity extends ReactActivity implements DefaultHardwareBackB
  }
  intent.putExtra(ORIENTATION, getIntent().getIntExtra(ORIENTATION, 0));
  setIntent(intent);
  - String key = intent.getStringExtra(KEY);
  - if (rootView.getChildCount() > 0)
  - rootView.removeViewAt(0);
  - if (NavigationStackView.scenes.containsKey(key)) {
  - scene = NavigationStackView.scenes.get(key);
  - if (scene.getParent() != null)
  - ((ViewGroup) scene.getParent()).removeView(scene);
  - rootView.addView(scene);
  - }
  }
  @Override
  