BundleConfig.cs

        public static void RegisterBundles(BundleCollection bundles)
        {
            bundles.Add(new ScriptBundle("~/Scripts/jquery")
                            .Include("~/assets/javascripts/vendors/jquery-{version}.js"));

            bundles.Add(new ScriptBundle("~/Scripts/app")
                            .IncludeFromSprocketFile("~/assets/javascripts/main.js"));

            var templateBundle = new Bundle("~/Scripts/templates").IncludeDirectory("~/assets/templates", "*.html");
            templateBundle.Transforms.Add(new HtmlBundleTransform());
            bundles.Add(templateBundle);
        }

Global.asax.cs

    public class Global : System.Web.HttpApplication
    {
        protected void Application_Start(object sender, EventArgs e)
        {
            BundleConfig.RegisterBundles(BundleTable.Bundles);
        }
    }

HtmlBundleTransform.cs

    public class HtmlBundleTransform : IBundleTransform
    {
        private readonly string javascriptVariableName;

        public HtmlBundleTransform()
            : this("JST")
        {
        }

        public HtmlBundleTransform(string javascriptVariableName)
        {
            this.javascriptVariableName = javascriptVariableName;
        }

        public void Process(BundleContext context, BundleResponse response)
        {
            var sb = new StringBuilder();
            sb.AppendFormat("window.{0} = window.{0} || {{}};", this.javascriptVariableName);
            foreach (var file in response.Files)
                sb.AppendFormat("{0}['{1}'] = \"{2}\";", this.javascriptVariableName, Path.GetFileName(file.FullName), File.ReadAllText(file.FullName));
            response.Content = sb.ToString();
            response.ContentType = "text/javascript";
        }
    }