Implemented friendly forwarding. Had to add new methods to the Sessions Helper to store the URL from which a user was bounced from before authenticating.
Added a users index page and index styling. This is required so that logged in users can see all the other registered users of the site, woo.

Added the index action to the Users controller, so that the full list of users can be passed to the index view.

Fixed the spec for someone going to the index page without being logged in. Put it to 'Sign in' instead of "Sign up".
Added proper test for the Users link and actually fleshed it out.