Done

I created a non REST comments controller action `approve`. This is the first time I've created an action in a controller that isn't RESTful outside of a static page. When should we use non-RESTful actions?

I went ahead and made my comments polymorphic since I've done similar things in other projects.

Resources:
- http://railscasts.com/episodes/154-polymorphic-association-revised for polymorphic associations. Specifically for finding the owner of a polymorhpic association through the parameters.

https://app.asana.com/0/11169835259596/11169835259598