adds cancan adapter to the scene and updates Gemfile
adds migration to roles table
adds the role model
updates seeds file with roles
adds role to admin user
adds accessibility to AdminUser role_id
updates seeds file to update the existing admin user with a role
adds cancan ability file
adds a select to the role attribute on the AdminUser resource new and edit pages
updates seeds file to create an AdminUser with campaign manager role
some experiments testing the ability file
Merge branch 'part2'