bradbirdsall/Swipe — pull request #425 by gabehayes (2014-02-07 04:21:53+00:00)
Title: add an unavailable callback

So I recently came across a case where I wanted to receive a callback when the slide was unable to go previous or next, because `continuous` was set to false and I was trying to swipe next or previous from the first or last slide.

This callback will be called only in that condition and send the usual `index, element` as arguments.