Unregister from notifications on dealloc. Handle case where there is a dangling notification observer still registered when a user cancells the sign-in
Unregister from notifications on dealloc. Handle case where there is a dangling notification observer still registered when a user cancells the sign-in

joelchen/AFOAuth1Client,pmulka/AFOAuth1Client,AFNetworking/AFOAuth1Client,lxcid/AFOAuth1Client,AmitaiB/AFOAuth1Client,orta/AFOAuth1Client