Extracting configurable Rubydora connection

By extracting the Rubydora connection, I'm able to reference it on
both the wrangling up from Fedora and the persisting down to Fedora.
Allow a property to be transformed to a predicate

Yes, the values are lost, but that's not the end of things.
Leaning on predicates instead of names

Given the powerful conversion function of Predicate, I'm wanting to
leverage that at the low level.