Android fling gesture breaks UI with setLayoutAnimationEnabledExperimental enabled

If you enabled animations on Android in the `example.js` (https://github.com/deanmcpherson/react-native-sortable-listview/blob/master/Sortable/example.js#L10)

By adding:
```
UIManager.setLayoutAnimationEnabledExperimental &&
UIManager.setLayoutAnimationEnabledExperimental(true);
```

And then when you activate a row and do the fling gesture it causes UI issues as seen in this screenshot:

Start with the animation setup in Sortable/example.js around line 10 and reproduce the Android fling after activating a row with experimental layout animation enabled. Compare the resulting UI with the linked screenshot and trace the gesture and animation behavior. Done means the fling no longer causes the reported UI issues.

Written by the indexing model from the issue text.