Fixes #10 : Rename CGRectCenter to ADRectCenter
Fixes #4 : Animations below navigation bar
new transition to simulate ios7 native transition
ios7 + toolbar support
Merge branch 'master' of github.com:applidium/ADTransitionController

Conflicts:
	ADTransitionController/ADZoomTransition.m
take navbar and toolbar hidden into account to compute inset.
Inset compute should be recursive as UINavigationController seems to do that.
needs to update the contentOffset as well