All UIResponder subclasses get different CDRSpy treatment.

Set up spy class to work with certain UIKit subclasses

refactor to isolate ugly method.
Simplify spec as current implementation is iOS 5-safe
Proxy the description method in the same style as the others.
CDRSpyInfo teardown restores original class

This seems to address a number of strange UIKit-specific issues when code under test is compiled with ARC.
iOS specific ugliness can be deleted when iOS 5 runtime is no longer supported.