Noticed that the exporter has an explicit list of css objects for export.  This causes problems, because I need to have the mappingplugin.css file included in the export, and don't want to maintain a separate export branch.  Also, noticed that the exporter is not including mobile.css.  So I added a concat operation to the Gruntfile.js for the css files (concats base.css, mappingplugin.css, and mobile.css into output base.css).  In addition, changed the copy operations so that the two remaining css files get copied in, and the base.css doesn't get copied over.  A bit of a kludge, but it will satisfy my needs with minimal outside changes.