Fix UIA :preferences strategy for Xcode 6.1 and iOS < 8.1 simulators

Builds on:

* https://github.com/calabash/calabash-ios-server/pull/83
* https://github.com/calabash/calabash-ios-server/pull/82

and discussions from:

* Touch gesture timeouts on Xcode 6.1 Simulators https://github.com/calabash/calabash-ios/issues/566

Also fixes "Intermittent crashing when testing against iOS Simulators." https://github.com/calabash/calabash-ios/issues/582  by removing the offending code.

There was at least one case (see discussion above) where the test environment was Xcode 6.1 and iOS 8.1 and setting a token in the NSUserDefaults defaults did not work.