Upgraded Exude to 0.2.0 in order to use the constructor overload for Action (instead of Action<'obj>) in first-class tests. The object supplied to the Action<'obj> delegate is an instance of the test class that contains the test methods adorned with the [<FirstClassTests>] attribute. However, these particular unit tests don't actually use this instance.
Added XML documentation to ReturnValueMustNotBeNullException class.
Added XML documentation to ReturnValueMustNotBeNullAssertion class.
Made RootNamespace element's value, in Idioms.FsCheck project, consistent with the other projects in the solution.
Added AssemblyInfo file to Idioms.FsCheck project.
Removed xUnit.net Extensions from Idioms.FsCheckUnitTest project because they are not used.