updated code signing (why they had changed is a mystery) and added EMBED variable to hooks and cucumber profiles to control whether or not screenshots are embedded
provides tests for 'calabash backdoor crashes when called with
undeclared selector' fix on the calabash-ios-server

https://groups.google.com/d/msg/calabash-ios/eHpH2hh2TUQ/rIosmm7s2GcJ