new md5 library

[Luiz Henrique de Figueiredo <lhf@...>]

I've written an MD5 library for Lua 5.0. It's available at
	http://www.tecgraf.puc-rio.br/~lhf/ftp/lua/lmd5.tar.gz

Unlike Roberto's MD5 library ( http://www.inf.puc-rio.br/~roberto/md5/ ),
this one is based on the MD5 library by Rivest, but also supports the one by
Deutsch, which has a similar API. These libraries are available at
	http://userpages.umbc.edu/~mabzug1/cs/md5/md5.html
Some recent systems distributions already include Rivest's library somewhere;
see the Makefile for details.

Enjoy.
--lhf