[CMake] VS2010 support

[Bill Hoffman]

CVS CMake has initial VS 2010 support.   Currently the following tests 
are failing:

          45 - Preprocess (Failed)
          56 - CustomCommand (Failed)
          69 - ExternalProject (Failed)
          92 - PrecompiledHeader (Failed)
          93 - VSExternalInclude (Failed)


If anyone wants to try it, that is fine with me.  I am not interested in 
bug reports until I get all the tests working.  I am however, interested 
in patches if anyone has a fix for anything broken or not yet implemented.

Thanks.

-Bill