Fixed: remove unused library

This library is not being used anywhere in diva.js (oneFingerScroll is never called).
Fixed: overlapping events libraries

We do not use the dragscrollable on mobile devices (enables dragging of div elements on desktop). Instead we use jquery.kinetic for inertial scrolling. Only enabling the relevant plugins for a session reduces Events overhead and prevents possible problems.
Fixed: plugin icons do nothing when tapped on mobile

Previously, jquery.kinetic was preventing click events from firing. To fix this, we have to bind the 'touchend' instead of 'click' event when on mobile, and tell kinetic to not steal and scroll on touch events when icons are touched.

Fixes #188