expand fcrepo3 vocab
Downgrade active-fedora gem because 7.1.x breaks cul_scv_hydra object saving (e.g. ContentAggregator)
Prep v0.19.4
revert over-specification of AF gem version and remove unneccessary override of create
finish documenting FCRepo 3 vocabs as RDF::StrictVocabulary
WIP ore proxies spun off from structured aggregators