How to add reference to System.Web.Optimization for MVC-3-converted-to-4 app

I’m trying to use the new bundling feature in a project I recently converted from MVC 3 to MVC 4 beta. It requires a line of code in global.asax, BundleTable.Bundles.RegisterTemplateBundles();, which requires using System.Web.Optimization; at the top. When I do this, I get the red squiggly lines that say, “Are you missing an assembly reference?” … Read more