cordova run ios --target does not use versioned simulators

This stack-overflow points out an issue with the 'validTargets' list of simulators, and the actual list returned by ios-sim
http://stackoverflow.com/questions/22310526/cordova-start-specific-ios-emulator-image/29705666#29705666

We need to use the ios-sim device list as validTargets so users can accurately target 'iPhone-4s, 7.1' ...