Add links to the leaderboard in both the footer and the header. In order to fit the link in the header, the padding on each of the header links needs to be dropped to 19px, rather than the 20px it was before.
On reflection, the leaderboard probably shouldn't be part of the users controller, but rather part of the application controller. It's a page about the aplication in general, not about a given user.
Update the routes and the users_controller
Add unit tests