Lua FAQ update

[steve donovan <steve.j.donovan@...>]

http://www.batbytes.com/luafaq/

Version 1.5 answers a few new questions, like:
1.37 How does module() work?
1.38 What are weak tables?
1.39 What is the difference between the various ways to quote strings?
7.7 What am I allowed to do with the Lua stack and its contents in my
C functions?
7.8 What is the difference between userdata and light userdata?

And generally cleaned up some entries (thanks to spir for pointing out
problem with newproxy example, and Dirk Feytons for new C API
material)

Have a read, and please be picky; this needs to be solid as possible
if people are going to be leaning on it.

steve d.