Include Newtonsoft.Json.dll in .vsix

Add Newtonsoft.Json.9.0.1 as Asset to .vsixmanifest.

Author: jcansdale

src/GitHub.VisualStudio/GitHub.VisualStudio.csproj

@@ -475,6 +475,11 @@
     </EmbeddedResource>
   </ItemGroup>
   <ItemGroup>
+    <Content Include="..\..\packages\Newtonsoft.Json.9.0.1\lib\net45\Newtonsoft.Json.dll">
+      <Link>Newtonsoft.Json.dll</Link>
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+      <IncludeInVSIX>true</IncludeInVSIX>
+    </Content>
     <Content Include="Resources\preview_200x200.png">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
       <IncludeInVSIX>true</IncludeInVSIX>

src/GitHub.VisualStudio/source.extension.vsixmanifest

@@ -37,6 +37,7 @@
     <Asset Type="Microsoft.VisualStudio.VsPackage" d:Source="Project" d:ProjectName="GitHub.StartPage" Path="|GitHub.StartPage;PkgdefProjectOutputGroup|" />
     <Asset Type="Microsoft.VisualStudio.MefComponent" d:Source="Project" d:ProjectName="GitHub.InlineReviews" Path="|GitHub.InlineReviews|" />
     <Asset Type="Microsoft.VisualStudio.MefComponent" d:Source="File" Path="Rothko.dll" />
+    <Asset Type="Microsoft.VisualStudio.Assembly" d:Source="File" Path="Newtonsoft.Json.dll" TargetVersion="[14.0,15.0)" AssemblyName="Newtonsoft.Json, Version=9.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed" />
   </Assets>
   <Prerequisites>
     <Prerequisite Id="Microsoft.VisualStudio.Component.CoreEditor" Version="[15.0.25824.0,)" DisplayName="Visual Studio core editor" />