Fix when game is in Portrait mode, returning true in ShouldAutorotate() caused exception.
Detecting application supported orientations. It fixes iOS8 rotation issues while starting application (Either landscape mode was not working well or in portrait mode application was throwing exceptions).
Fixed landscape orientation detection. On iOS landscape right is XNA's landscape left, and iOS left is XNA's right.
Merge branch 'iOS8_RotationIssuesFix' of http://github.com/ebatiano/MonoGame into pr3158

Conflicts:
	MonoGame.Framework/iOS/iOSGameViewController.cs