EragonJ/Trip.js — pull request #9 by noahhendrix (2013-06-08 06:00:45+00:00)
Title: Add onTripChange callback

This is useful for when we want to know the trip has changed. I used this to extend functionality — adding a focus property that is a string containing a selector to an element to focus:

```js
{
onTripChange: function(t) { if(t.focus) { $(t.focus).focus(); } }
}
```