yahns 1.2.0 - preliminary kqueue/FreeBSD support

This release now depends on "kgio-sendfile", a (hopefully temporary)
fork of the original sendfile gem for mainline ruby trunk
compatibility and a (probably correct) FreeBSD-related bugfix.

kqueue/FreeBSD support is considered highly experimental.  Of course;
you should never rely on anything in production unless you can get bugs
fixed in every part of your stack; even the kernel.  yahns (ab)uses
kqueue and epoll in uncommon ways, so you may encounter subtle kernel
bugs along the way.

Because yahns has been self-hosting its own website for months without
crashes or major problems (BORING! :P), I've decided to start hosting the
yahns website <http://yahns.YHBT.net/README> with ruby trunk (currently
r45341).

yahns - dangerous by design (and sleepy!)