Lua status update

[Phil E]

I need to rewrite the parser (again), fix variable arguments, multiple
returns, and function environment handling, at which point I think it
will be suitable for inclusion in Guile. (Not that it'll be a drop-in
replacement for Lua, but at some point the only way I will be able to
improve it is through feedback) I'd also like to have some 5.2
compatibility, the rest of the standard library, and a wrapper around
the C runtime that allows Guile to use Lua C extensions. But with that
said, GSOC is over (which means if anyone reading this would like to
have a whack at any of this, be my guest), I'm happy with the results
and I hope we can get it included in Guile later on. Big thanks to
Andy and Ludo for putting up with me.