Another using

src/MusicStore/Startup.cs

@@ -4,6 +4,7 @@ using Microsoft.AspNet.Builder;
 using Microsoft.AspNet.Diagnostics;
 using Microsoft.AspNet.Diagnostics.Entity;
 using Microsoft.AspNet.Identity;
+using Microsoft.Data.Entity;
 using Microsoft.Framework.Caching.Memory;
 using Microsoft.Framework.ConfigurationModel;
 using Microsoft.Framework.DependencyInjection;