Android JNI asset extraction support (API 9+)

Signed-off-by: Filip Wasil <filip.wasil@tieto.com>
Agreed. @filipwasil, this seems like it could be useful, but only as an auxiliary part of the library. If you can reformulate it as a port/ module, and commit to maintaining it, that could be useful, otherwise you might simply host it separately and interested users can pull it as needed. Thanks.