Create admin form for posts
Add CanCan for authorization
Include Devise helpers in specs
Create abilities for posts
Create abilities for categories
Rename AdminUser model to User
Authorize post resources in controller
Create Tag model
Create empty? method for categories
Associate posts and tags
Create a tag_list_for view helper
Add tags to posts#show in admin
Remove breadcrumbs

They're a bit wonky and not angularized.
Move category list to navigation menu