kgio 2.10.0 - slimming down...
The largely-unused autopush functionality is now a no-op.
Existing applications will probably not notice, and are
better off using MSG_MORE anyways if they're on Linux.
Our poll(2) wrapper now uses rb_hash_clear if available,
reducing global method cache dependence.
shortlog of changes since 2.9.3:
README: remove reference to Rainbows!
writev: update comment on preserving errno
poll: avoid rb_funcall for rb_hash_clear
minor doc updates
remove autopush support and make it a no-op
HACKING: update URL for Message-ID lookup