new directive options(selectors, zindex, disable); track active element by index (compatibility with ng-repeat track by index); debouncing drag eveng; using css classes to track items; if handles in use, only drag if event is on handle; correcting event.target if needed, cloning also classes, streamline css
fix: unbind on refresh, before checking for enabled
fix: remove debug code
Merge pull request #1 from EFEducationFirstMobile/master

new directive options(selectors, zindex, disable); track active element ...