iOS 8 fix/hack for rotating the Message Panel.
Should replace with an Auto Layout view.
Fix/hack for horizontal presentation of Message Panel in iOS 8.
Hack/fix for iOS 8 issue where frame's animation is offset from (0, 0) origin when animation starts from landscape.
Will soon convert Message Panel to use Auto Layout.
Merge pull request #129 from apptentive/iOS8

Additional fixes for iOS 8