F# VS2010

[ChrisAnn]

In order to get the F# Koans to compile in VS2010 I needed to remove and re-add the reference to FSharp.Compiler.CodeDom so that it pointed to version 2.0.0.0.

I'm not sure how this affects people who already had the VS2008 libraries installed so I have not created a pull request.

[ChrisMarinos]

I'll take a look at it when I get a moment. At some point in the (hopefully) near future, I'd like to move the F# branch to its own repo like some of the other languages and revisit the koans, project setup, etc.