fix unix.c to return just a function
get rid of setmetatable(, nil) since packages don't need this anymore in
5.1

new instalation scheme???

test empty socket.select no windows.

bug by mathew percival?

test it on Windows!!!

leave code for losers that don't have nanosleep

ftp.send/recv return bytes transfered?
new scheme to choose family/protocol of object to create
change ltn13 to make sure drawbacks are obvious
    - check discussion
use mike's "don't set to blocking before closing unless needed" patch?
take a look at DB's smtp patch (add "extra argument" table)


adicionar exemplos de expansão: pipe, local, named pipe
testar os options!
- Thread-safe
  - proteger get*by*.* com um mutex GLOBAL!
  - proteger ou atomizar o conjunto (timedout, receive), (timedout, send)
  - inet_ntoa também é uma merda.

* protect doesn't catch errors by error and assert
* BUG NO SET DO TINYIRC!!! SINISTRO.
* _VERSION, _DEBUG, etc.
* talk about new create field in HTTP, FTP and SMTP
* talk about the non-blocking connect in the manual
* think about how to extend http, ftp, smtp to use special send and receive
* functions for non-blocking so they can be used in the context of the
* dispatcher!
* adjust manual for new sock:send returns.
* think about a dispatcher.
    * - it creates a server and receives a function that will do the work on
    * received connections
    * - this function is invoked with the client socket
    * - it calls special send and receive functions that yield on timeout
* arranjar um jeito de fazer multipart/alternative
* what the hell does __unload do?
    * it's there just in case someone wants to use it.