Unregister as observer on  application launch notification in notification block
Unregister from notifications on dealloc. Handle case where there is a dangling notification observer still registered when a user cancells the sign-in
moved unregister notification to end of block
Renamed unregisterFromApplicationLaunchNotifications to removeApplicationLaunchNotificationObserver
Merge branch 'master' of git://github.com/eriksundin/AFOAuth1Client into eriksundin-master

Conflicts:
	AFOAuth1Client/AFOAuth1Client.m