2.2.3
Bumping copyright year
Reorganizing to move -description to NSObject #pragma mark
Compile AFNetworking for iOS 6 and iOS 7
[Issue #2001] Override setResponseData: to ensure that data object uses desired allocator
[Issue #1884] Don't override Content-Type header value if specified in request serializer HTTPRequestHeaders property
[Issue #2007] Respecting NSJSONReadingMutableContainers reading option in AFJSONObjectByRemovingKeysWithNullValues