yahns 1.3.0 - new mailing list + fixups

Since RubyForge is going away, this release updates the
documentation to point to the new public-inbox and mailing list
at at:

	yahns-public@yhbt.net
	(no subscription required, plain text only)

ssoma[1] git archives: git://yhbt.net/yahns-public
browser-friendly archives: http://yhbt.net/yahns-public/
Traditional mailing list subscription is possible by sending
a blank email to: yahns-public+subscribe@yhbt.net

This also reworks master->worker signalling to use a pipe,
avoiding problems with libraries which do not respond well
to being interrupted by signals.  There are also minor
bugfixes and cleanups, see "git log -p" for full details.

[1] http://ssoma.public-inbox.org/