Add iPhone 6 & 6+ support.

Add iPhone 6 & 6+ support following the recent release of [Cordova iOS 3.7.0](http://cordova.apache.org/announcements/2014/11/06/cordova-ios-3.7.0.html).
For more info, see [CB-7632](https://issues.apache.org/jira/browse/CB-7632).
This could help fix #2.