Adding the CustomTransitioningContext.
Adding a completion block for when an animation finishes in the segmentController
Updating RZSegmentViewController to work on Pre iOS7 builds.  Also adding a demo.
Updating Comments
fixing the random bounds issue during animation.
Fix containment logic
Adding an animated hook to change the Selected ViewController.
Further fix to containment logic for swapping segment while not visible
Better solution for swapping while not visible
Merge pull request #6 from Raizlabs/AR_CustomTransitions

Adding Custom transitions to RZSegmentViewController