Fix change in Preferences path for Xcode6.1 simulators
fix comment on prefs path
Force defaults to be written it can be detected
Helper methods to simplify simulatorPreferencesPath
Fix memory leaks in simulatorPreferencesPath
Merge pull request #83 from calabash/feature/fix-xcode61-sim-prefs-path-write-to-defaults

Fix Xcode 6.1 simulator preferences path