PHPZiplib 0.3.1 - Whoops

I kinda slipped up with my 0.3 release, this was a 'debugging' version, forgot to change back some funtionality. Luckily I found out soon enough, so 0.3.1 really works! And when I was still at it, I reduced the amount of memory needed to index a zipfile. Don't worry, I will try to reduce this even more, just wait and see :).