Add self-repl task for debugging.
Add self-repl task for debugging.

jkutner/heroku-buildpack-lein,cedricpineau/heroku-buildpack-clojure-phantomjs,heroku/heroku-buildpack-clojure,cloudControl/buildpack-clojure,mstine/heroku-buildpack-clojure,heroku/heroku-buildpack-clojure,nvbn/heroku-buildpack-clojure