Orientation handing TWMessageBarManager - Updated

Okay, this is my second attempt while incorporating the latest master project changes I was able to resolve a bug I discovered last night while using it within my other project.

I've tested in simulator for iOS 6.1 and noticed that the *messageBarOffset* was adding whitespace and was unnecessary. I have not been able to test pre 6.1 to see if it is still necessary. 

Rotation of physical device works without any distortion to the message contents. Thank you for the other fixes you added and the width/height clean up. It fixed resize issues after orientation changes.

NOTE: iOS simulator has been known to not rotate correctly. From your earlier screenshot it implied that it was the reason it came out looking that way. Try it on a device if you still have issues.