Add unit test projects
Add unit test for CancellationTokenSourceExtensions.CancelAfter
Add tests for CompletedTask methods
Add tests for CoreTaskExtensions.Finally methods
Add tests for CoreTaskExtensions.Select methods
Add tests for TaskBlocks.Using methods
Add tests for CoreTaskExtensions.Then methods
Use a much tighter tolerance for TestCancelAfter, and reduce the overall test time
Merge pull request #15 from sharwell/unit-testing

Unit testing