Apple has released second betas of iOS 9 and watchOS 2 to developers, continuing the beta cycle for its next-generation mobile operating systems announced at WWDC for the iPhone, iPad, iPod touch, and the Apple Watch. Featuring a build number of 13A4280e, the second iOS 9 beta features a number of under-the-hood improvements from the first beta, focusing on improving the stability and reliability of the new features in the operating system. The latest…