MVC bundle CDN files
http://www.dotnetjalps.com/2014/07/cdn-in-aspnet-mvc-bundling.html
bundles.UseCdn = true;
bundles.Add(new ScriptBundle("~/bundles/jquery",
@"//ajax.aspnetcdn.com/ajax/jQuery/jquery-1.10.2.js"
).Include(
"~/Scripts/jquery-{version}.js"));