Apple has released an update to its MobileMe iDisk application, adding iPad support and iOS 4 multitasking capabilities. MobileMe iDisk 1.2 is now a universal app providing native support for the iPhone, iPod touch and iPad. The update also adds iOS 4 multitasking support for iPhone 4, iPhone 3GS and third-generation iPod touch devices with not only Fast App Switching support but also background audio allowing users to stream audio files from their…