Moved #validate_checksum! from DulHydra::HasContent to DulHydra::DatastreamBeahvior (closes #1033)
to the datastream checksum.
DulHydra::HasContent now delegates :validate_checksum! to :content
Merge pull request #1086 from duke-libraries/1033-validate-checksum

Moved #validate_checksum! from DulHydra::HasContent to DulHydra::Datastr...