Use wget for downloading instead of curl.
Use wget for downloading instead of curl.

With curl you can't silence the progress bar without disabling stderr
entirely, which is awful. wget lets you tone down the verbosity (not
entirely), but doesn't have an overall timeout setting. However,
bin/compile is called by Utils.spawn in the slug compiler, which
handles timeouts.

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