Changes from downstream appcelerator/ios-sim to support the new PrivateFrameworks for iPhoneSimulator
Fixed ""Failed to find class DTiPhoneSimulatorSystemRoot at runtime" error
Fixed ""The application that opened iOS Simulator failed to send all of the required information" error
Merge pull request #73 from phonegap/issue-72

Fixes #72 - Xcode 5.1 use of new PrivateFrameworks for iPhoneSimulatorClient