No support for eager loading of ReferenceSets

AFAICT, Storm provides no way to eagerly load ReferenceSet content. I can emulate an SQLObject prejoin by requesting multiple classes in one query and throwing them away, but accessing each ReferenceSet still hits the DB to get the list of objects.

I should be able to tell Storm to get a set of objects and some of their interesting ReferenceSets in a single query.

SQLAlchemy can do this -- see http://www.sqlalchemy.org/docs/05/ormtutorial.html and search for 'eager'.