bug fix to play nice with sencha touch 2.3

We have included ol3 map in a sencha touch 2.3 mobile application. Within the mobile app, the map crash as soon as we click on it. We have been able to pin point the problem (and do a dummy fix) with the ol-whitespace.js file.

OL3 version: 3.0.0-beta.5 
File: ol-whitespace.js

Line: 25856
var touch = event.changedTouches.item(0);
replaced by
var touch = event.changedTouches[0];

No more crash, the click event is now propagated successfully to the sencha app handlers.