[iOS] add support to launch the app as 64-bit in simulator

When specified "app.archs['iPhoneSimulator'] << 'x86_64'" and use iOS 7 retina 4 simulator,
we can launch 64-bit simulator.
Fix non-retina iPad simulation in iOS7

Allow to start the simulator with a non-retina iPad with iOS7

merged #133
[iOS] fix where non-retina iPad simulator is not launch

if string which indicates to launch iOS simulator for iPad that contains single quotation, (like 'iPad')
non-retina iPad simulator is not launch.