need to update htmlpurifier first

if the document contains a link to the target, but that link is not in the parsed result, don't return an error, but also don't return the parsed document

closes #150

for https://github.com/aaronpk/webmention.io/issues/150

closes #96

XRay now looks for images inside the HTML and does not consider those empty posts

Add support for parsing MF2 JSON

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

move target check outside of all format classes and operating on the final parsed JSON so that it works regardless of the input content type

for https://github.com/aaronpk/Aperture/issues/56

closes #89

closes #92

we also need the controller files!

GAE now runs composer itself and dev dependencies are not installed

https://cloud.google.com/appengine/docs/standard/php7/specifying-dependencies

forgot a key word

let's try the default

deploy Google App Engine version to PHP 7.2

closes #86

more consistently returns HTTP 410 now

This adds a new property, "meta", which includes alt text and has room to include additional properties later.

closes #85

Fix h-entry with h-card before it

The previous check removed a h-card, but this one still takes the first of the original array. Which means, in the case of `h-card+h-entry`, the h-card get’s removed, but then the if triggers and the `h-card` is selected.

replaces #78

closes #79

* a single h-entry and h-card, where the h-entry has no URL, will result in a permalink page with that h-entry
* multiple h-entrys followed by an h-card is a feed