remove console.logs
Add worker/iFrame dropdown
Add “click” and “dblclick” to mouse events
Change the svg event handler to use the event module

- `preventDefault()`s only “touchmove” events for now
- makes “diffX/Y” and “deltaX/Y” properties more consistent
- makes firing of multitouch and non-multitouch events more consistent between touch and mouse events
Merge branch 'master' into elements-under-pointer
Fix drag events for mouse
Make pointerup events from touchcancel events
Listen to touchcancels
Handle touchcancel events
Add support for mouse button properties