Factoring out request and response serialization tests into separate files
Adding tests for encodable and re-encodable query string parameters
Replacing test.com with example.com
[Issue #2093] Using serial queue to synchronize creation of session tasks to prevent bug where NSURLSession creates tasks with non-unique identifiers (see radr://5871104061079552)
AFMaximumNumberOfToRecreateBackgroundSessionUploadTask -> AFMaximumNumberOfAttemptsToRecreateBackgroundSessionUploadTask
[Issue #2118] Changing maximumNumberOfConcurrentOperations to 1 for URL session delegate queues, to enforce serial execution of callbacks like in previous releases