React to aspnet/KoreBuild#155

NuGet.config

@@ -2,6 +2,7 @@
 <configuration>
   <packageSources>
     <add key="AspNetCore" value="https://dotnet.myget.org/F/aspnetcore-ci-dev/api/v3/index.json" />
+    <add key="AspNetCoreTools" value="https://dotnet.myget.org/F/aspnetcore-tools/api/v3/index.json" />
     <add key="NuGet" value="https://api.nuget.org/v3/index.json" />
   </packageSources>
 </configuration>

build/common.props

@@ -11,11 +11,8 @@
     <PublicSign Condition="'$(OS)' != 'Windows_NT'">true</PublicSign>
   </PropertyGroup>
 
-  <Target Name="EnsureInitialized"
-          BeforeTargets="Build"
-          Condition="!Exists('$(MSBuildThisFileDirectory)..\.build\common.props')">
-    <Error File="$(MSBuildProjectFile)"
-           Text="Project has not been initialized. Run 'build initialize' in the solution directory." />
-  </Target>
+   <ItemGroup>
+    <PackageReference Include="Internal.AspNetCore.Sdk" Version="1.0.0-*" PrivateAssets="All" />
+  </ItemGroup>
   
 </Project>