glyphicons-halflings-regular.eot
glyphicons-halflings-regular.svg
glyphicons-halflings-regular.ttf
glyphicons-halflings-regular.woff

<?xml version="1.0" encoding="UTF-8"?>
<system.webServer>
   <staticContent>
       <remove fileExtension=".eot" />
       <remove fileExtension=".ttf" />
       <remove fileExtension=".otf"/>
       <remove fileExtension=".woff"/>
       <mimeMap fileExtension=".eot" mimeType="application/vnd.ms-fontobject" />
       <mimeMap fileExtension=".ttf" mimeType="font/ttf" />
       <mimeMap fileExtension=".otf" mimeType="font/otf" />
      <mimeMap fileExtension=".woff" mimeType="font/x-woff" />
   </staticContent>
</system.webServer>

bundles.Add(new StyleBundle("~/bundles/maincss")
                    .Include("~/Content/bootstrap/bootstrap.css")
                    .Include("~/Content/bootstrap/bootstrap-theme.css")
                    .Include("~/Content/hbl-full.css"));

IItemTransform cssFixer = new CssRewriteUrlTransform();

bundles.Add(new StyleBundle("~/bundles/maincss")
                    .Include("~/Content/bootstrap/bootstrap.css", cssFixer)
                    .Include("~/Content/bootstrap/bootstrap-theme.css", cssFixer)
                    .Include("~/Content/hbl-full.css", cssFixer));

Install-Package Twitter.Bootstrap.MVC

public class BootstrapBundleConfig
{
    public static void RegisterBundles()
    {
        // Add @Styles.Render("~/Content/bootstrap") in the <head/> of your _Layout.cshtml view
        // For Bootstrap theme add @Styles.Render("~/Content/bootstrap-theme") in the <head/> of your _Layout.cshtml view
        // Add @Scripts.Render("~/bundles/bootstrap") after jQuery in your _Layout.cshtml view
        // When <compilation debug="true" />, MVC4 will render the full readable version. When set to <compilation debug="false" />, the minified version will be rendered automatically
        BundleTable.Bundles.Add(new ScriptBundle("~/bundles/bootstrap").Include("~/Scripts/bootstrap.js"));
        BundleTable.Bundles.Add(new StyleBundle("~/Content/bootstrap").Include("~/Content/bootstrap.css"));
        BundleTable.Bundles.Add(new StyleBundle("~/Content/bootstrap-theme").Include("~/Content/bootstrap-theme.css"));
    }
}

routes.IgnoreRoute("{folder}/{*pathInfo}", new { folder = "fonts" });