Don't bundle clojure, exclude compilation artefacts from jar

[lorddoig]

Pretty much the same as https://github.com/jebberjeb/fsmviz/pull/4 :)

If you're happy with it I would be grateful if you could push up new versions of this and fsmviz to Clojars!

[arichiardi]

I think this one is a good one. Probably clojurescript should also be excluded ..@lorddoig ping