supportTouch on Chrome

I have been having an issue on Android/Chrome with drag. Tracked it down to supportsTouch.  This fixed it for me: 

Original line:

`supportsTouch = "createTouch" in glob.doc,` 

Replaced with 

`supportsTouch = "ontouchstart" in document.documentElement,`

Now works in Chrome and continues to work on iOS/Safari.
