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
* Removed Devise comments from User controllers
* Cleaned up Devise syntax
Merge pull request #3 from adwns42/add-homepage-navigation

Added sign up / in / out links to layout