ClojureScript has no format-function in the newest version

The format-function was dropped from core, see
https://groups.google.com/d/msg/clojurescript/N31hDu83zeI/tGqaCTnZyE4J
http://dev.clojure.org/jira/browse/CLJS-324
Merge pull request #30 from abp/master

ClojureScript has no format-function in the newest version