+ renamed om_tut / om-tut to omingard.
+ added lein-garden CSS preprocessor.
omingard.css: better styles.
Fixed lein-garden setup. Not sure why it only works when the output paths in project.clj and src/omingard_css/core.clj are different ~_~ (creates an empty /resources/application.css - but at least resources/public/application.css works).