Fixed issue #1381.

Preserve body and its fixtures until jniDestroyBody() is called.
Reimplementation of TextureUnpacker.
really reverted arrow changes :)
Merge pull request #1837 from jksiezni/master

Box2d: Fixed issue #1381. Missing fixtureB in Contact when Body is removed.
Merge pull request #1849 from codepoke/texture-unpacker

Texture Unpacker implementation with support for ninepatch