Minor reorganization
Reorganizing to move -description to NSObject #pragma mark
Reorganizing method sections to more closely match interface
[Issue #2001] Override setResponseData: to ensure that data object uses desired allocator
Merge pull request #2002 from AFNetworking/experimental-memory-optimization

Override setResponseData: to ensure that data object uses desired allocator
[Issue #1916] Fixing function declaration for AFXMLDocumentResponseSerializer
Merge branch 'master' of github.com:AFNetworking/AFNetworking
[Issue #2003] Only nil out image view request operation if callback matches current request operation
removesKeysWithNullValues in nested arrays

(previously only in dictionaries)
[Issue #2008] Fixing detected error domain for response serializers
Merge pull request #2007 from jilouc/master

JSON response serializer: removesKeysWithNullValues of objects in nested arrays
Minor formatting
[Issue #2007] Respecting NSJSONReadingMutableContainers reading option in AFJSONObjectByRemovingKeysWithNullValues
[Issue #1884] Don't override Content-Type header value if specified in request serializer HTTPRequestHeaders property
Bumping version to 2.2.3
Update README.md
Update README.md
Fixes #2020 - Race Condition in UIImageView+AFNetworking when called twice with the same URL
[Issue #2032] Documenting change in behavior of NSOutputStream property
Merge branch 'master' of github.com:AFNetworking/AFNetworking