Made build work with .net 3.5 build too

Author: mwhelan

TestStack.BDDfy.Samples/TestStack.BDDfy.Samples.csproj

@@ -69,7 +69,9 @@
     </ProjectReference>
   </ItemGroup>
   <ItemGroup>
-    <None Include="packages.config" />
+    <None Include="packages.config">
+      <SubType>Designer</SubType>
+    </None>
   </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <PropertyGroup>

TestStack.BDDfy.Tests/TestStack.BDDfy.Tests.csproj

@@ -44,7 +44,8 @@
   <ItemGroup>
     <Reference Include="NSubstitute, Version=1.6.1.0, Culture=neutral, PublicKeyToken=92dd2e9066daa5ca, processorArchitecture=MSIL">
       <SpecificVersion>False</SpecificVersion>
-      <HintPath>..\packages\NSubstitute.1.6.1.0\lib\NET40\NSubstitute.dll</HintPath>
+      <HintPath Condition="$(TargetFrameworkVersion)=='v4.0'">..\packages\NSubstitute.1.6.1.0\lib\NET40\NSubstitute.dll</HintPath>
+      <HintPath Condition="$(TargetFrameworkVersion)!='v4.0'">..\packages\NSubstitute.1.6.1.0\lib\NET35\NSubstitute.dll</HintPath>
     </Reference>
     <Reference Include="nunit.framework, Version=2.6.2.12296, Culture=neutral, PublicKeyToken=96d09a1eb7f44a77, processorArchitecture=MSIL">
       <SpecificVersion>False</SpecificVersion>