updated Elasticsearch.Net.JsonNET to sign using the key and add a prebuild event to generate the key if its not there

Author: Mpdreamz

src/Serialization/Elasticsearch.Net.JsonNET/Elasticsearch.Net.JsonNet.csproj

@@ -32,6 +32,12 @@
     <NoWarn>1591,1572,1571,1573,1587,1570</NoWarn>
     <DocumentationFile>bin\Release\Elasticsearch.Net.JsonNet.XML</DocumentationFile>
   </PropertyGroup>
+  <PropertyGroup>
+    <SignAssembly>true</SignAssembly>
+  </PropertyGroup>
+  <PropertyGroup>
+    <AssemblyOriginatorKeyFile>..\..\..\build\keys\keypair.snk</AssemblyOriginatorKeyFile>
+  </PropertyGroup>
   <ItemGroup>
     <Reference Include="Newtonsoft.Json, Version=6.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed, processorArchitecture=MSIL">
       <SpecificVersion>False</SpecificVersion>
@@ -56,9 +62,14 @@
     </ProjectReference>
   </ItemGroup>
   <ItemGroup>
+    <None Include="keypair.snk" />
     <None Include="packages.config" />
   </ItemGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
+ <PropertyGroup>
+    <PreBuildEvent Condition=" '$(OS)' != 'Unix' ">IF NOT EXIST "$(SolutionDir)..\build\keys\keypair.snk" (CD "$(SolutionDir).." &amp;&amp; "build.bat" CreateKeysIfAbsent &amp;&amp; CD %25~dp0)
+</PreBuildEvent>
+  </PropertyGroup>
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
        Other similar extension points exist, see Microsoft.Common.targets.
   <Target Name="BeforeBuild">