FYI: .Net 4 support, VS2010, all kind of dependency upgrades, NuGet

I've quickly upgraded the whole project to VS 2010 and .NET 4, and almost all its dependencies to the newest versions. Switched to NuGet references for Spark, StructureMap and RhinoMocks.

Note that this upgrade is barely tested, I only ensured that it works fine for the .Net 4 assembly which I wanted to generate documentation for: MathNet.Numerics. Therefore, please consider this pull request only as a "For your Information" note, pulling at your own risk.

Thanks,
Chris