Build: Update grunt to 0.3.9. Fixes #8257 - Minified files are missing terminating semicolon.

Author: scottgonzalez

package.json

@@ -26,7 +26,7 @@
   ],
   "dependencies": {},
   "devDependencies": {
-    "grunt": "0.3.7",
+    "grunt": "0.3.9",
     "grunt-css": "0.1.1",
     "grunt-compare-size": "0.1.1",
     "request": "2.9.153",