try removing again

client/ember-cli-build.js

@@ -50,7 +50,7 @@ module.exports = function(defaults) {
   // Use `app.import` to add additional libraries to the generated
   // output files.
   //
-  app.import('node_modules/foundation-sites/dist/js/foundation.min.js');
+  // app.import('node_modules/foundation-sites/dist/js/foundation.min.js');
   // If you need to use different assets in different
   // environments, specify an object as the first parameter. That
   // object's keys should be the environment name and the values