rel=tag hentry/hreview backcompat

[gRegorLove]

Fixes #157

[Zegnat]

I still have to read up on how php-mf2 actually handles backwards compatibility parsing but this looks like a good way to rewrite the rel links.

One thing that comes to mind – but may already apply to other back-compat work – is what happens if the link is inside an element that will be parsed as an e-* property? Sounds to me like the parser will need to exclude these newly added <data> elements from its output there?

[aaronpk]

@Zegnat makes a good point. Currently this ends up inserting the data element into the content HTML and text. I've added a failing test and sent it as a PR against your branch. If you merge gRegorLove#2 then this PR will be updated with the failing test.

[Zegnat]

If the test can be rerun and it turns out it passes I say lets merge this 👍

One downside discussed on IRC seems to be fringe and not worth fretting over for now. Maybe?

Yeah, it works, but still fails if there's an hentry.entry-content nested in an hentry.entry-content.

entry-content in entry-content is odd for sures, probably safe to ignore for now