Adding a 'nuget-build' feed; fixing the feed line-up: 'dotnet-core' and 'AspNetMaster'.

Author: John Beisner

build/NugetConfigFile.targets

@@ -20,7 +20,6 @@
         <![CDATA[
     <add key="BlobFeed" value="https://dotnetfeed.blob.core.windows.net/dotnet-core/index.json" />
     <add key="templating" value="https://dotnet.myget.org/F/templating/api/v3/index.json" />
-    <add key="dotnet-core" value="https://dotnet.myget.org/F/dotnet-core/api/v3/index.json" />
     <add key="aspnet" value="https://dotnet.myget.org/F/aspnetcore-release/api/v3/index.json" />
     <add key="websdkfeed" value="https://dotnet.myget.org/F/dotnet-web/api/v3/index.json" />
     <add key="cli-deps" value="https://dotnet.myget.org/F/cli-deps/api/v3/index.json" />
@@ -31,6 +30,8 @@
     <add key="vstest" value="https://dotnet.myget.org/F/vstest/api/v3/index.json" />
     <add key="web-api" value="https://dotnet.myget.org/F/dotnet-web/api/v3/index.json" />
     <add key="symreader-native" value="https://dotnet.myget.org/F/symreader-native/api/v3/index.json" />
+    <add key="AspNetMaster" value="https://dotnet.myget.org/F/aspnetcore-master/api/v3/index.json" /> 
+    <add key="nuget-build" value="https://dotnet.myget.org/feed/nuget-build/api/v3/index.json" /> 
         ]]>
       </NugetConfigCLIFeeds>