Bump dependency versions

* Clojure 1.5.1 => 1.6.0
* ClojureScript 0.0-2173 => 0.0-2202
* lein-cljsbuild 1.0.2 => 1.0.3
* lein-npm 0.3.0 => 0.4.0
* escodegen 1.3.0 => 1.3.2