Updates Cedar and related project configuration

Spec suite test bundles now include their suite applications as build dependencies
Strange duplicate output from UIKit-StaticLibSpecBundle was fixed by removing test reporter environment variable
Fixes intermittent CI failures on travis
Adds UIGestureRecognizer support improvements to CHANGES.markdown
Adds a stub for UINavigationController

in iOS 8+ the navigation stack is managed asynchronously internally, so we have to forward the run loop one tick in some cases.
UINavigationController+Spec supports -topViewController and -visibleViewController
Adds support for naive delegate messaging when pushing/popping

Other UINavigationControllerDelegate methods not supported yet