Let's try to create the whole NuGetRefBuild path

Author: asbjornu

src/GitVersionCore/GitVersionCore.csproj

@@ -191,7 +191,7 @@
   </Target>
   <Target Name="AfterBuild" DependsOnTargets="Clean">
     <!-- NugetRefBuild -->
-    <MakeDir Directories="$(SolutionDir)NuGetRefBuild" />
+    <MakeDir Directories="$(SolutionDir)NuGetRefBuild\lib\Net45" />
     <Copy SourceFiles="$(OutputPath)GitVersionCore.dll" DestinationFolder="$(BuildDir)NuGetRefBuild\lib\Net45" />
     <Copy SourceFiles="$(OutputPath)GitVersionCore.pdb" DestinationFolder="$(BuildDir)NuGetRefBuild\lib\Net45" />
     <Copy SourceFiles="$(OutputPath)GitVersionCore.xml" DestinationFolder="$(BuildDir)NuGetRefBuild\lib\Net45" />