IBuilder moved to the namespace Microsoft.AspNet.Builder. Fixing it in the musicstore.
IBuilder moved to the namespace Microsoft.AspNet.Builder. Fixing it in the musicstore.

aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore