Added sign up / in / out links to layout

* In order to rout to the correct pages with these links:
   - Generated devise User controllers
   - Added controllers argument to routes
* Cleaned up form syntax within Sign up / in / out pages
@dgalarza Yes, I just combed the docs and there's a lot in there that is specific to interacting with Devise that isn't covered clearly or at all. But I guess I could try to find that stuff on google if I need it later.