Resolve a build issue.

Author: EmmaZhu

src/ResourceManager/KeyVault/Commands.KeyVault/Commands.KeyVault.csproj

@@ -183,6 +183,9 @@
       <SpecificVersion>False</SpecificVersion>
       <HintPath>..\..\..\packages\Newtonsoft.Json.6.0.8\lib\net45\Newtonsoft.Json.dll</HintPath>
     </Reference>
+    <Reference Include="System.Spatial, Version=5.6.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
+      <HintPath>..\..\..\packages\System.Spatial.5.6.0\lib\net40\System.Spatial.dll</HintPath>
+    </Reference>
     <Reference Include="System" />
     <Reference Include="System.Management.Automation, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL" />
     <Reference Include="System.Net" />