Allow newer 0.3.x releases of grunt.

Author: scottgonzalez

package.json

@@ -52,7 +52,7 @@
   ],
   "dependencies": {},
   "devDependencies": {
-    "grunt": "0.3.9",
+    "grunt": "~0.3.9",
     "grunt-css": "0.2.0",
     "grunt-compare-size": "0.1.4",
     "grunt-html": "0.1.1",