closes #105

The test is checking for notes, but 'Bridge Fed' is, in fact, an article according to the post discovery algorithm. Also, I'm adding as note that the main difference between a note and an article is that the latter has a title, while the first doesn't.

* looks through the full mf2 tree for step 7 of authorship https://github.com/indieweb/authorship/issues/2
* if no author h-card is found, falls back to returning the author URL without other data instead of missing author

closes #95

To make it possible to consume feeds of pre-rendered Microformats2 JSON
data, we need to be able to discover that it is a Microformats2 JSON
file using the known MIME types documented  in
http://microformats.org/wiki/microformats2-mime-type

closes #89

closes #86

closes #79

closes #77

closes #62

* adds test of instagram-atom feed with individual authors per item
* dedupes atom/rss title if it's a prefix of the content

Treats `https://example.com` and `https://example.com/` as equivalent when comparing URLs. Closes #33

closes #32