added .Xunit() extension method to run tests and return bool on pass/…

[RejectKid]

Regarding issue I have added an extension method to run tests on a given dll. I also put unit tests for it, thus adding another tests.dll file in the resources of the MakeSharp Tests

[sapiens]

Thanks for your contribution. I'm quite busy right now, so it could take some time until I can take a look at the changes.