Fixed issue causing getAuthor to return non-h-card microformats

In cases such as https://jonnybarnes.net/note/58 as of 2014-05-16, where a page has one h-entry without an author property, and a separate h-card *after* the h-entry representing the author,
getAuthor would incorrectly return the h-entry (or any other microformat with a url property with the same hostname as the h-entry) rather than the h-card.
Updated README with changelog