Issue #527 - Update Intern to 2.2.0

Author: Mike Taylor

package.json

@@ -21,7 +21,7 @@
     "grunt-contrib-cssmin": "~0.9.0",
     "grunt-combine-media-queries": "~1.0.19",
     "load-grunt-tasks": "~0.6.0",
-    "intern": "2.1.1",
+    "intern": "2.2.0",
     "grunt-contrib-imagemin": "~0.7.1",
     "grunt-cssnext" : "^0.3.0",
     "suitcss-utils-display" : "^0.4.0",