Changes in minimum OS version: iOS 6

Starting in daily build 2014.2277, we are changing the minimum supported version on iOS from 5.1 to 6. This means that if you do a device build with 2014.2277 (or later), your app will not run on a device whose version is below iOS 6.

This change is needed to move our iOS architecture forward, and finally pay off technical debt that has been accumulating for nearly 18 months, which is an eternity in the mobile space.