Alternative to jQuery

@w01f

Pushed to 1.0.x-dev, can you test it please?

Removed the jQuery UI Droppable dependency, switched to the core Sortable library (https://github.com/SortableJS/Sortable).
Not exacly the purpose of the library, but its working.

@jmauricio my team will be working on a PoC for integrating media folders with our current project, and I'll follow up here. Might be a week or two.