dd/js/drag-gestures.js:2
This module is the conditional loaded dd module to support gesture events
in the event that dd is loaded onto a device that support touch based events.
This module is loaded and over rides 2 key methods on DD.Drag and DD.DDM to
attach the gesture events. Overrides DD.Drag._prep and DD.DDM._setupListeners
methods as well as set's the property DD.Drag.START_EVENT to gesturemovestart
to enable gesture movement instead of mouse based movement.