AFNetworking/AFNetworking — pull request #2062 by streeter (2014-05-13 19:59:12+00:00)
Title: Call super copyWithZone: in subclasses.

By not calling the superclass' implementation, we end up not actually
copying over all the properties from the superclass. In this case, if we
call -copy on an instance of an AFJSONRequestSerializer, the headers for
the serializer are not copied over (as well as anything else that was
changed in the AFHTTPRequestSerializer implementation).