set VisualStudioVersion to 12.0 on build
set VisualStudioVersion to 12.0 on build

fsprojects/Paket.VisualStudio,hmemcpy/Paket.VisualStudio,baronfel/Paket.VisualStudio,mrinaldi/Paket.VisualStudio,TheAngryByrd/Paket.VisualStudio