The latest version of iOS has arrived. Apple released a public beta of iOS 9 last week, an update that brings the company's News app, a revamped Siri and new multi-tasking features to iPhones and iPads. But unlike iOS 8, which brought some of the biggest changes to the platform to date, the changes in iOS 9 are mostly subtle -- though significant. [seealso URL= "http://mashable.com/2015/07/11/appl