Making URLs in the noir-auth article clickable

Currently, they are rendered as plain text on the website (http://www.clojure.by/2013-07-20-noir-auth.html ). This is not convenient for a reader - one has to carefully select the url with a mouse, copy it and paste in a new tab in order to follow the links.
Merge pull request #12 from DNNX/patch-1

Making URLs in the noir-auth article clickable