Start to add a simpler and more reliable API for iOS7+
Set deployment target to iOS 7
Fix transition when popping
Introduce a new UIViewController subclass for convenience
Fix memory leak
Update test view controller to demonstrate the new API usage
Remove trailing whitespaces
Fix 3D effect
Fix bug when pop ADTransformTransition
Add toolbar support
Update demo project to take advantage of toolbar
Changelog
Merge branch 'modern'

Conflicts:
	TransitionDemo/Classes/ALTransitionTestViewController.m
Change deployment target
Use ADTransitionController if iOS version <= 6 and UINavigationController if iOS version >= 7
Remove deprecated methods warnings
Different appearance between iOS 6 and 7
Coding style
Fix bug with navigationBar. Reset views in a correct state after animation.
Fix bug with frames during 3D animations on iOS7