Define creativeId as a strong pointer in ANNativeStandardAdResponse.
Define creativeId as a strong pointer in ANNativeStandardAdResponse.

appnexus/mobile-sdk-ios,appnexus/mobile-sdk-ios,appnexus/mobile-sdk-ios,appnexus/mobile-sdk-ios,appnexus/mobile-sdk-ios,appnexus/mobile-sdk-ios