Introduced a TestCase class constructor overload that takes an Action as an argument.
Chained the TestCase class constructors by adapting an Action to an Action<object>.
Added a Guard Clause.
Added first-class tests demonstrating that Action is now a valid constructor argument.
Added XML documentation.
Added Zero29 NuGet package,

in order to be able to properly advance version numbers without having to
manually edit AssemblyInfo files.
Incremented minor version,

in order to indicate that the addition of a constructor overload to
TestCase is a new feature. This resolves #16
(https://github.com/GreanTech/Exude/issues/16).