Remove the ContainerResource from Datastream.  Monkeypatch RDF::DateTime
to support nanoseconds.
Merge pull request #501 from projecthydra/ldp_updated_fedora

Remove the ContainerResource from Datastream

This gets things working better with Fedora4, but still results in failures so it's being merged without regard to Travis. This commit also contradicts the previous commit 6eb6518 so some squashing might be needed.