Add search for MSBuild
Add search for MSBuild

Newer versions of Visual Studio require a newer version of MSBuild,
bundled with VS instead of the .NET Framework.

continuoustests/ContinuousTests,continuoustests/ContinuousTests,continuoustests/ContinuousTests,continuoustests/ContinuousTests,continuoustests/ContinuousTests,continuoustests/ContinuousTests,continuoustests/ContinuousTests