Fixed directory structure

Perspex.sln

@@ -104,7 +104,7 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "BindingTest", "samples\Bind
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "XamlTestApplicationPcl", "samples\XamlTestApplicationPcl\XamlTestApplicationPcl.csproj", "{EA113F1A-D8D7-4142-9948-353270E7EBAE}"
 EndProject
-Project("{D954291E-2A0B-460D-934E-DC6B0785DB48}") = "RenderHelpers", "Shared\RenderHelpers\RenderHelpers.shproj", "{3C4C0CB4-0C0F-4450-A37B-148C84FF905F}"
+Project("{D954291E-2A0B-460D-934E-DC6B0785DB48}") = "RenderHelpers", "src\Shared\RenderHelpers\RenderHelpers.shproj", "{3C4C0CB4-0C0F-4450-A37B-148C84FF905F}"
 EndProject
 Global
 	GlobalSection(SharedMSBuildProjectFiles) = preSolution
@@ -113,7 +113,7 @@ Global
 		src\Shared\PlatformSupport\PlatformSupport.projitems*{54f237d5-a70a-4752-9656-0c70b1a7b047}*SharedItemsImports = 4
 		Shared\RenderHelpers\RenderHelpers.projitems*{3c4c0cb4-0c0f-4450-a37b-148c84ff905f}*SharedItemsImports = 13
 		src\Shared\PlatformSupport\PlatformSupport.projitems*{811a76cf-1cf6-440f-963b-bbe31bd72a82}*SharedItemsImports = 4
-		Shared\RenderHelpers\RenderHelpers.projitems*{3e908f67-5543-4879-a1dc-08eace79b3cd}*SharedItemsImports = 4
+		src\Shared\RenderHelpers\RenderHelpers.projitems*{3e908f67-5543-4879-a1dc-08eace79b3cd}*SharedItemsImports = 4
 	EndGlobalSection
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU

src/Windows/Perspex.Direct2D1/Perspex.Direct2D1.csproj

@@ -111,7 +111,7 @@
       <Name>Perspex.SceneGraph</Name>
     </ProjectReference>
   </ItemGroup>
-  <Import Project="..\..\..\Shared\RenderHelpers\RenderHelpers.projitems" Label="Shared" />
+  <Import Project="..\..\Shared\RenderHelpers\RenderHelpers.projitems" Label="Shared" />
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <Import Project="..\..\..\packages\SharpDX.2.6.3\build\SharpDX.targets" Condition="Exists('..\..\..\packages\SharpDX.2.6.3\build\SharpDX.targets')" />
   <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">