Revert "Try to fix the broken cljs build"

This reverts commit cdd9450.

My assumption here was completely off - the real problem was the
piggieback update.

Author: bbatsov

project.clj

@@ -96,8 +96,7 @@
                         :resource-paths ["test/resources"]
                         :test-paths ["test/clj"]}
              :test-cljs {:test-paths ["test/cljs"]
-                         :dependencies [[org.clojure/tools.nrepl "0.2.13"]
-                                        [cider/piggieback "0.3.2"]]}
+                         :dependencies [[cider/piggieback "0.3.2"]]}
 
              :sysutils {:plugins [[lein-sysutils "0.2.0"]]}