Upgrade!

Looks like I have to go to OpenCV version 2 after all.  Apparently cvCalcEigenObjects wasn’t wrapped in the OpenCVSharp 1.1pre1a release, but it looks like it is there in 2.0.  I could, of course, P/Invoke my way into the OpenCV DLL and use the function, but, uh… No.  So upgrade it is!