started S4 class-based approach for cleaner more flexible interface
writing continues, various edits
updated documentation (autogenerated)
questions for Duncan (should probably move to issues tracker once we have Github connection again)
Default copyright clause added to eml_dataset
ideally this should instead become part of the prototype in the S4 model
rdf example, valid but probably less useful than the rdfa
examples of what S4 coercion methods might look like; still working out questions