remove aspnetbeta8 form nuget.config. The packages are now on NuGet.org

Author: glennc

samples/1.0.0-beta8/HelloWeb/NuGet.Config

@@ -2,7 +2,6 @@
 <configuration>
   <packageSources>
     <clear />
-    <add key="AspNetVNext" value="https://www.myget.org/F/aspnetbeta8/api/v3/index.json" />
     <add key="NuGetorg" value="https://api.nuget.org/v3/index.json" />
   </packageSources>
 </configuration>