[TASK] Major refactoring

* Replaces jQuery with zepto js
* Drops support for older browsers (especially for IE < 10)
* Removes all polyfills and shims which have been needed for those browsers
* Refactors megapony media object
* Removes javascript config file
* Removes all plugins (will be integrated step by step into framework if reasonable)
* Separates framework config/styling from app config/styling
* Replaces loading image gif with a css solution

Fixes #6