Feature/cljs

Hi Niklas,

I invested some more time to port my changes to clj-rdfa. In my application knowl:edge (https://github.com/jocrau/knowl-edge) everything works fine now. There were some glitches with the goog.Uri library (it escapes paths  which leads to wrong results for URIs like urn:uuid:75889010-c99a-46b5-a5cb-8300adb75b31). It still needs some testing on other browsers than recent Chrome/Firefox on Mac (I extended the js/Node object).

I have added some  explanations how to use the ClojureScript feature to the README.

It would be great to have an RDFaAPI implementation in clj-rdfa similar to your approach in your rdfa-lab. But that would be a different pull request ;-)

Feel free to contact me, if you have any questions.

Best
Jochen