Added additional variables for NuGet (see #201)

Not sure. The versioning is so complex if you are not into semver, that all the terminology is too misleading. Simple developers need simple things, such as NuGetVersion (use for NuGet), Version (use for display), AssemblyVersion (use to stamp assembly), etc. Maybe I am overthinking and trying to make it too easy, but FullSemVer means nothing for 99% of the developers.