WebSub is probably finalised before we make a release anyway. Here is
the official spec: https://www.w3.org/TR/websub/
Mostly just comments that have been changed. Some references to PuSH <0.4
are left because they actually refer to PuSH 0.3 and that's not WebSub...
The only actual code change that might affect anything is FeedSub->isPuSH()
but the only official plugin using that call was FeedPoller anyway...
Note that these tests won't pass on master branch yet as the join/leave don't work, and there's a bug in Activity parsing which prevents interop between new feeds and old remote subscribers (both fixed in this branch).
Current test run includes:
* register accounts (via web form)
* local post
* @-mention using path (@domain/path/to/user)
Subscriptions, webfinger mentions, various paths to subscription and unsubscription, etc to come.
