[TIMOB-17293]Xcode 6 support

Testing instruction

build iOS-sim

1. Old things should work the way as they used(i.e Xcode 5.1.1 and below)
 * `path/to/ios-sim launch <path/to/build/application.app> --sdk 7.1 --family iphone`

2. With new Xcode Find all sims.
  *  `path/to/ios-sim showallsimulators`
3. With New Xcode 
  * `path/to/ios-sim launch <path/to/build/application.app> --udid <UDIDOFTHESIMULATOR>`