Fixes disableScroll option on mobile

I had some issues with the `disableScroll` option stopping touches on mobile (tested on iOS7). To fix this in my own app I used the following code. Perhaps i'm just using it wrong, but I couldn't get it to disable scrolling as is.

To replicate:  
Open this fiddle in Chrome with touch events enabled. Swipe left/right and the slider will cycle like normal, regardless of the option being true of false.
http://jsfiddle.net/H2rgR/2/

Working fiddle with code from PR branch:
http://jsfiddle.net/H2rgR/3/

BTW, thanks for the great work! This saved me a ton of time.