ExnpandableTextView doesn't maintain expanded state changes between orientation/config changes #35

ExnpandableTextView doesn't maintain expanded state changes between orientation/config changes.

How to reproduce:

1. Remove android:configChanges from manifest of current Demo.
2. Run the app.
3. Expand ExpandableTextView.
4. and
5. Change orientation of the device.

ExpandableTextView loses its expanded state.