sleepy_penguin 3.4.0 - minor updates

Most notably the mailing list is now subscription-optional
on the bogomips.org server:

	sleepy-penguin@bogomips.org

If you want to keep receiving email updates, you'll need to
resubscribe by sending a message to:

	sleepy-penguin+subscribe@bogomips.org

Migrating subscribers can't be done automatically as librelist
(our old host) doesn't publish subscriber lists.  But you don't
have to subscribe, either, HTTP archives are available at:

	http://bogomips.org/sleepy-penguin/

There you'll also find links to ssoma/public-inbox for
extracting the mail archives to git.

shortlog:
      test_kqueue_io: add test for deleting items
      test_inotify: add test for rm_watch
      extconf: detect inotify_init1 in libc
      inotify: cleanup Inotify::Event creation
      switch documentation to olddoc
      change mailing list to sleepy-penguin@bogomips.org
      relax license to LGPLv2.1+ (from v2.1 && v3 only)
      cleanup documentation links and ignores
      gemspec: add dev dependency on test-unit 3.x
      README: label the link to the mailing list archives
      GNUmakefile: drop more RubyForge references
      README: stop mentioning Rubinius
      gemspec: use minitest, not test-unit