Hydra::Works::GenericWork Behaviors

[kevinreiss]

The points below are from @elrayle original comments in code. I took out a reference Hydra::Works::File since that class is something that we decided not implement. Which of these are behaviors that actually need to be implemented in hydra-works?

• Hydra::Works::GenericWork can NOT aggregate Hydra::PCDM::Collection
• Hydra::Works::GenericWork can NOT aggregate Hydra::Works::Collection
• Hydra::Works::GenericWork can NOT aggregate Works::GenericWork unless it is also a Hydra::Works::GenericFile
• Hydra::Works::GenericWork can aggregate Hydra::Works::GenericFile
• Allow GenericWork to have both GenericWorks and GenericFiles as members

[awead]

@kevinreiss also covered in samvera/hydra-pcdm#23 but you'd probably want integration tests here to verify that?

[eliotjordan]

Working on this in https://github.com/projecthydra-labs/hydra-works/tree/gen_work_has_gen_files. Will watch for what happens in #72 based on bug report in #71.

[kevinreiss]

Subsumed by #77.