parse clojurescript files

I have added the necessary functions to parse `clojurescript` files.
Until it is implemented by `tools.namespace`. See: http://dev.clojure.org/jira/browse/TNS-29?focusedCommentId=36741#comment-36741
Please integrate it with the required parameters, as you wish.

Thanks,
Yehonathan. 
It seems like this finds both clojurescript and clojure sources - can you rename this to just `find-sources`?