-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