Added empty Comment model.
Migrated database to use comments model.
Added many to one relation for comments/posts.
Added subroute for comments under posts.
Added empty comments controller.
Added comments and form to post template.
Added comment creation to controller.
Added comment listing.

Also fixed a syntax error I overlooked.
Refactored comments listing into its own partial.
Refactored comment form into partial.
Added comment destruction.
Added destruction of comments to post destruction.
Added basic HTTP auth to posts and comments.