Add role model. Remove role from user model.
Create roles. Update ability model. Update seed file. Remove role from user table. Remove role methods in student model. Remove profile from user table.
Merge branch 'admin_refactor' of https://github.com/periwinklepath/mksdir

Conflicts:
	app/views/layouts/_navigation.html.haml
	db/schema.rb
	db/seeds.rb