reflection check

[martinklepsch]

Leiningen comes with lein check which allows for easy checking of any reflection in Clojure namespaces on the classpath. This isn't very straightforward with boot and would be a nice addition to this library of tasks.

The implementation of lein check can be found here: https://github.com/technomancy/leiningen/blob/master/src/leiningen/check.clj