Update autorotate to use recent PHP Exif Library (v0.9.3+)

I had an issue with the autorotate module. Updating the PEL library to the recent version from https://github.com/lsolesen/pel fixed the issue for me. I'm not sure if this update is a good move, there was a huge whitespace commit that makes it hard to track the changes.

I did not get any log entries, just getting error 500 triggered in autorotate.php at line 50: ``$jpeg->load($data);``

After updating the library everything works fine again on my local machine.

PEL is not actively developed anymore.