Add button to toggle 50% alpha on demo views.
Rewrite pop code to provide iOS7 style animations.
Rewrite push code to provide iOS7 style animations.
Rewrite popToViewController to provide iOS7 style animations.

This refactor updates the code to rely on popViewControllerAnimated: instead of duplicating animation work.
Rewrite replaceRightViewController code to provide either iOS7 push style or fade animations.
Add iOS7 style swipe-to-navigate-back functionality.
Document iOS7 style animations and swipe-to-navigate-back functionality.
Prefer constants to defines.
Implement iOS6+ state preservation and restoration.
Cleaner autoresizingMask fix (refactor #9.)
Remove unintentionally committed commented out lines.
Add missing didMoveToParentViewController: calls.
Lock to KIF to ~> 1.0.
SGBDemoTabBarController.m needs to be compiled for the tests to run.
Setup SGBDemoAppDelegate for testing harness needs.
Slight code style improvement.
Revert to "check and fail first" instead of "indented if's" for push/pop sanity checks.

(Per request of project maintainer.)
Fix all (previously broken) tests.

The tests were broken because they were waiting for the "Screen #" navigation bar title to be gone, but the navigation bar would then contain a back button (in some cases) with that title. Now there is a separate label in the demo view so you can check for the appearance/absence of the navigation bar title and view separately.
Ensure views get removed along with popped controllers.
Document KIF tests (and add instructions to run) in README.