Add :language-in and :language-out

Since https://github.com/clojure/clojurescript/commit/b33bde39fe838d367939b55b9dadb0480ea00a7c Clojurescript allows language-in and language-out to be specified.
Merge branch 'master' into patch-1

Conflicts:
	sample.project.clj
Merge pull request #310 from paulbutcher/patch-1

Add :language-in and :language-out to sample.project.clj