Added support for new iOS devices

Added the following tasks to support the new iOS simulators in XCode 6:

launchiPad-2Simulator - iPad-2
launchiPad-AirSimulator - iPad-Air
launchiPad-RetinaSimulator - iPad-Retina
launchiPhone-4sSimulator - iPhone-4s
launchiPhone-5Simulator - iPhone-5
launchiPhone-5sSimulator - iPhone-5s
launchiPhone-6-PlusSimulator - iPhone-6-Plus
launchiPhone-6Simulator - iPhone-6
launchResizable-iPadSimulator - Resizable-iPad
launchResizable-iPhoneSimulator - Resizable-iPhone

The original tasks still exist and function correctly:
createIPA
launchIOSDevice
launchIPhoneSimulator
launchIPadSimulator