#2 pull request updated.

Finished the rigtht code version for https://github.com/NLua/KopiLua/pull/2 pull request. I don't know the exact reason for closing the previous (maybe because the big changes) but this change would make better the code's usage. This way it wouldn't be needed to specifically compile for unix/linux but simply use the same dll. And it doesn't change much about the program, it only makes it's usage simplier. Please consider pulling it in your code.