Resource view refactoring.
Taggable list produced by helpers.
Semantic markup for Articles.
Added semantic markup for Materials.
Added semantic markup for Pages.
Added semtantic markup to Sites.
Added semantic markup to Snippets.
Refactored nav partial.
Added users CRUD.
Registerable users.
Added user roles and improved user CRUD.
Added user registration.
Added display_name and slug to User.
Made Articles and Users related.
Path list editable for acts_as_pathable.
404, 403 and 401 handling.