Only set ds content in #create_datastream for managed and inline
Merge pull request #460 from dchandekstark/create-ds-content

Only set ds content in #create_datastream for managed and inline
RDFDatastream#content= patched to accept IO, matching Rubydora::Datastream API
Fixes #461
Merge pull request #462 from dchandekstark/461-rdf-ds-content-eq-io

RDFDatastream#content= patched to accept IO