Update Podspec to support osx
Update Podspec to support osx

AFNetworking fully supports both iOS and OSX.
Since this is just a category on AFHTTPRequestOperationManager and
AFHTTPSessionManager the pod spec should inherit the dependencies of
the Base Spec

luxe-eng/valet-ios.AFNetworking-AutoRetry,shaioz/AFNetworking-AutoRetry,lexicalunit/AFNetworking-AutoRetry