Schmetterling contains AOT'd classfiles on clojars.

This cleans up `project.clj` to avoid accidentally putting class files in library jars.

The currently-deployed 0.0.7 version contains a bunch of outdated classfiles, causing difficult-to-debug issues like this: https://github.com/caribou/caribou-development/commit/ec3b8d194fa0def30d18e1f4cd8deffecf631b3d#commitcomment-5530840

I recommend pushing out a bugfix version with no AOT soon.