Update of PyLua

[forcecore]

Hi,

I've modified pylua for Python3 for my interest. If you want, I'll make a PR.
https://github.com/forcecore/pylua

In OpenRA (game), they only support Lua scripting but I find Python easier. The modified script does its job for my task:

https://github.com/forcecore/yupgi_alert0/blob/master/lua/ai.py
https://github.com/forcecore/yupgi_alert0/blob/master/lua/ai.lua

[kevinw]

A pull request would be great. Either way, looks like great work!