Fix editable on parse-entities.
Update can-add-* based on history

In addition to fetching. We don't fetch at the right level to update
can-add-* only when we are fetching.
Removed unneeded logging.
Merge pull request #297 from MastodonC/feature/authn-fixes

Fix authn rules
profile download doesn't fall over, but data is suspect.
Move to latest released liberator.

This contains our patch and also allows multimethods as decision fn.