AFNetworking/AFNetworking — pull request #1242 by 0xced (2013-08-21 20:16:24+00:00)
Title: Workaround radar 14783825

Testing for `[[notification object] isKindOfClass:[NSURLSessionTask class]]` should be enough but NSURLSessionTask subclasses lie about their class membership. See http://www.openradar.me/14783825

This commit can be hopefully reverted if rdar://problem/14783825 is fixed before iOS 7 goes public.