Users can view their stories

A few things

-the user model is fully CRUDable, as far as I can tell.

-I went ahead and made a new story, using un nested resources. To make sure things link up, I am referencing the `user_id` in `session`. 

-From the profile page, a user can click a link that routes to stories/index. Because of their session id, we can define the user in the index action, and then pull their stories. This is working, and doesn't require any tricky workarounds with routes. It is also a cleaner URL.