Update OnDemandDAOHandler to use a JSONFileDAO for persistence, and choose a safe unique file name for each model.
Update OnDemandDAOHandler to use a JSONFileDAO for persistence, and choose a safe unique file name for each model.

jlhughes/foam,jlhughes/foam,foam-framework/foam,foam-framework/foam,foam-framework/foam,foam-framework/foam,foam-framework/foam,jlhughes/foam,jlhughes/foam