src: add typesafe intrusive list

src: add typesafe intrusive list

This is a replacement for the QUEUE macros.  It implements the same
functionality but in a way that lets the compiler typecheck it.

PR-URL: https://github.com/iojs/io.js/pull/667
Reviewed-By: Bert Belder <bertbelder@gmail.com>
Reviewed-By: Fedor Indutny <fedor.indutny@gmail.com>
Reviewed-By: Trevor Norris <trev.norris@gmail.com>