Quinstance 0.2.1

My apologies to the Linux/OS X users out there! Despite what I thought was adequate testing I managed to let a major bug slip through in both versions so far. Version 0.2.1 now uses an absolute path when calling VMFII, which takes care of the program flat out not working on those operating systems.

On top of that, this version should also properly handle maps whose worldspawn entity doesn't have "classname" "worldspawn" as the first line of its block, which is a great number of them, from the look of things.