Update grunt 1.5.3, grunt-jquery-content 3.1.0

Unblock builds on the new infrastructure.

Author: supertassu

package.json

@@ -21,7 +21,7 @@
     }
   ],
   "dependencies": {
-    "grunt": "0.4.5",
-    "grunt-jquery-content": "3.0.0"
+    "grunt": "1.5.3",
+    "grunt-jquery-content": "3.1.0"
   }
 }