zepto (core + data module) added
test support for zepto, override **positionUsing** with margin-left
simplifies code, uses *margin-left* (http://jsperf.com/translate3d-vs-xy/28) instead of translate
removes **barrita.jquery.json**, package.json completed
fix source
new version uglified
removes **index.html**, its contents should be in gh-page branch
adds zepto to README