AFNetworking download progressing

AFNetworking download progressing

http://stackoverflow.com/questions/13512846/progressview-for-downloading-some-files-in-object-c

http://stackoverflow.com/questions/16453655/objective-c-downloading-file-with-progress-bar

http://stackoverflow.com/questions/16393653/how-to-use-progressview-in-xcode-for-show-downloads-status