Fix issues where setting llSetTextureAnim(FALSE... did not work properly).

I ended up amalgamating patches from http://opensimulator.org/mantis/view.php?id=7313 and http://opensimulator.org/mantis/view.php?id=7318
Thanks a lot to both bobshaffer2 and cinderblocks.
Add cinderblocks and bobshaffer2 to contributors.