Only a week after the last iOS 9.1 beta was released, Apple has now posted a third beta of iOS 9.1 for registered iOS developers. As with the prior beta, iOS 9.1 appears to be primarily focused on adding developer-level enhancements for the iPhone 6s and iPhone 6s Plus, for features such as 3D Touch and Live Photos. This latest beta focuses mostly on fixing a number of issues from the prior beta. Registered iOS developers can download the iOS 9.1…