text: Title: Figure out mf2 h-feed authorship
  Body: Source: HTML
  Target: Atom/XML
  Example: https://granary.io/url?input=html&output=atom&url=https://news.indieweb.org/en
  Expected feed author: IndieNews en @ https://news.indieweb.org/en
  Actual feed author: The first h-card on the page
  Note: The feed id and title is correct, but the `<author>` element is not.
  
  Suggested solution: Granary should follow the [representative-h-card-parsing](http://microformats.org/wiki/representative-h-card-parsing) algorithm, and if no h-card is found then use `<title>` and page URL as the author, instead of incorrectly assuming the first h-card is the page's author.