-scale has existed since iOS 4.0. No need to check for it.
Update README.md

Gives deprecated warning without error parameter
Merge pull request #1972 from petard/patch-1

Update README.md
[Issue #1974] Deprecating setAuthorizationHeaderFieldWithToken:
Merge branch 'master' of github.com:AFNetworking/AFNetworking
Merge pull request #1966 from sgoodwin/master

-scale has existed since iOS 4.0. No need to check for it.
Update example to use NSFileManager -URLForDirectory:...
Adding removesKeysWithNullValues property to AFJSONResponseSerializer
Merge branch 'master' of github.com:AFNetworking/AFNetworking
Added property 'disableNotificationsForNetworkActivity' to be able to disable posting notifications for specific operations
Added property 'disableNotificationsForNetworkActivity' to be able to disable posting notifications for specific operations
[Issue #1799] Implement respondsToSelector for NSURLSession delegate methods to conditionally respond to optional selectors if and only if a custom block has been set
Adding missing call to delegate in URLSession:downloadTask:didResumeAtOffset:expectedTotalBytes:
Merge remote-tracking branch 'remotes/origin/master'
Merge remote-tracking branch 'upstream/master'