Revert "Migration"

This reverts commit 91bef13d31.

.gitignore

@@ -26,7 +26,6 @@ nuget.exe
 *.sln.ide
 project.lock.json
 .vs
-.vscode/
 .build/
 .testPublish/
 global.json

src/Microsoft.AspNetCore/CertificateLoader.cs

@@ -179,7 +179,10 @@ namespace Microsoft.AspNetCore
             {
                 var certificate = TryLoad(X509KeyStorageFlags.DefaultKeySet, out var error)
                     ?? TryLoad(X509KeyStorageFlags.UserKeySet, out error)
-                    ?? TryLoad(X509KeyStorageFlags.EphemeralKeySet, out error);
+#if NETCOREAPP2_0
+                    ?? TryLoad(X509KeyStorageFlags.EphemeralKeySet, out error)
+#endif
+                    ;
 
                 if (error != null)
                 {

src/Microsoft.AspNetCore/Microsoft.AspNetCore.csproj

@@ -3,7 +3,7 @@
   <Import Project="..\..\build\common.props" />
 
   <PropertyGroup>
-    <TargetFramework>netcoreapp2.0</TargetFramework>
+    <TargetFrameworks>netstandard1.3;netcoreapp2.0</TargetFrameworks>
     <PackageTags>aspnetcore</PackageTags>
     <Description>Microsoft.AspNetCore</Description>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>

src/Microsoft.DotNet.Archive/Microsoft.DotNet.Archive.csproj

@@ -3,7 +3,7 @@
   <Import Project="..\..\build\common.props" />
 
   <PropertyGroup>
-    <TargetFramework>netcoreapp2.0</TargetFramework>
+    <TargetFramework>netstandard1.3</TargetFramework>
     <EnableApiCheck>false</EnableApiCheck>
   </PropertyGroup>
 

test/Microsoft.AspNetCore.FunctionalTests/Microsoft.AspNetCore.FunctionalTests.csproj

@@ -3,7 +3,7 @@
   <Import Project="..\..\build\common.props" />
 
   <PropertyGroup>
-    <TargetFramework>netcoreapp2.0</TargetFramework>
+    <TargetFrameworks>netcoreapp2.0</TargetFrameworks>
   </PropertyGroup>
 
   <ItemGroup>