Add grunt-cli to devDependencies

Author: alejofernandez

package.json

@@ -11,6 +11,7 @@
   },
   "devDependencies": {
     "expect.js": "^0.3.1",
+    "grunt-cli": "^1.2.0",
     "grunt-contrib-clean": "^0.6.0",
     "grunt-contrib-concat": "^0.5.0",
     "grunt-contrib-connect": "^0.8.0",