luajit support

[iwanbk]

would be great if we could use this library from luajit

[iwanbk]

Let me know what we need to do to support it, i could be a help :)

[jinq0123]

LuaPbIntf should support luajit if lua-intf can support luajit. We need to test lua-intf with luajit. Replacing lua-cpp lib with luajit should work.