changes for lua 5.3 compatibility

[gnarz]

I made some minor changes to ls_mysql.c to make it work with lua 5.3. I have been using this for some time now, so I am confident that it is all that needs to be done to achieve compatibility with lua 5.3, without breaking backwards compatibility with 5.2 and 5.1.

[anatol]

Thanks for doing this.

Just hit the same problem with 5.3 compatibility. Any ETA for merging this fix?

[blumf]

Pull it in. Think this covers #34 too, will close both

[anatol]

Thanks a lot. It worth making a new release that will be compatible with lua 5.3 and avoid issues to people who starts using the new version of lua.