pfefferle/wordpress-webmention — pull request #5 by snarfed (2013-11-17 02:16:01+00:00)
Title: add support for webmention v0.2's canonical rel="webmention"

retains backward compatibility with rel="http://webmention.org/"

the inspiration was trying to reply to one of tantek's posts, since tantek.com only has the rel="webmention" link.