initial check in
integration with Devise
added integration of CanCan.  The critical file is ability.rb,
everything else is support the registering and editing of users, taking
into account their role and the current user's role.
added a comment
updated documentation
initialized a new user to role=user on registration
improved seed contents
added example of using roles and views
added helper method to display roles in user edit/create
updated to rails 3.2.8
updated to RR 3.2.11
updated to Rails 4.1, Twitter Bootstrap 3.2.0, Postgres, and newer copies of Devise and CanCan