Removed dependency on org.clojure/tools.reader because it triggers a JS error

Hi James,

  running the example project results, on my system, in a JS error: `Uncaught TypeError: undefined is not a function`. I think the root cause is similar to http://dev.clojure.org/jira/browse/CLJS-685 (`cljs.core.PersistentArrayMap` is undefined). Removing the explicit dependency on `tools.reader` seems to fix it.

cheers,
--
Giuliano