Added Posts resource.
Added empty Posts controller.
Added blank constructor for Posts controller.
Added basic new post template.
Added new post form.
Added post create controller.
Added Posts model.
Added initial database schema.
Added basic post form handling.
Added basic post show view.
Added basic posting list.
Added some links to navigate around posts.
Added validators for posts model.
Check for valid post upon creation.
Added error messages to post creation form.
Added post edit form.

This changeset also includes a generic post add/edit form that is
renderred for either form. DRY!
Added post destruction controller and links.