Lots of changes, including adding core data fields to User, adding gravatar support, and adding a users controller + views to sit alongside devise views (still have to work in the authorization aspects from CanCan).
Updated sample data generation to include course enrollments (one course offering with two instructors and 50 students).
Fixed signup links and routes.  Added user auth controls on user pages.
tiny changes in routes and schema before pull
merged routes and schema from pull
Exercise model does not have Prompt but has an Exercise with many-to-one relationship with Steam