Renaming AFHTTPClient -> AFHTTPSessionManager
Adding Task argument to success and failure blocks
Creating AFHTTPRequestOperationManager class

Removing AFHTTPRequestOperation-related methods from AFHTTPSessionManager
Refactoring request operation batching to be class method on AFURLConnectionOperation
Finishing refactor of batched operations
Removing cancellation methods from AFHTTPRequestOperationManager

Removing enqueue operation method from AFHTTPRequestOperationManager
Updating AFNetworking.h