Dependencies version update

        Dependencies version update based on [lein-ancient "0.5.5"](https://github.com/xsc/lein-ancient) advices.
        Update version of :
          `clojure` to "1.6.0".
          `ring` to the latest.
          `lein-ring` to the latest.
          `clojurescript` to the latest.
          `lein-cljsbuild` to be compatible with `clojurescript` version.
    
        Other:
          `.gitignore` - added `.lein-*`.