Feature: Add Clojure support

I just did the steps outlined in this blog post and committed them:

[http://softnoise.wordpress.com/2010/03/15/clojure-source-files-in-quick-look-on-macosx/](http://softnoise.wordpress.com/2010/03/15/clojure-source-files-in-quick-look-on-macosx/)