update grunt and node dependency versions

package.json

@@ -21,19 +21,19 @@
     "node": "~0.8.0"
   },
   "dependencies": {
-    "underscore": "~1.3.3",
+    "underscore": "~1.5.1",
     "express": "~2.5.9",
-    "mustache": "~0.4.0",
+    "mustache": "~0.7.2",
     "socket.io": "~0.9.13"
   },
   "devDependencies": {
     "grunt-contrib-qunit": "~0.2.2",
-    "grunt-contrib-jshint": "~0.2.0",
+    "grunt-contrib-jshint": "~0.6.4",
     "grunt-contrib-cssmin": "~0.4.1",
-    "grunt-contrib-uglify": "~0.1.1",
+    "grunt-contrib-uglify": "~0.2.4",
-    "grunt-contrib-watch": "~0.2.0",
+    "grunt-contrib-watch": "~0.5.3",
-    "grunt-contrib-sass": "~0.2.2",
+    "grunt-contrib-sass": "~0.5.0",
-    "grunt-contrib-connect": "~0.2.0",
+    "grunt-contrib-connect": "~0.4.1",
     "grunt-zip": "~0.7.0",
     "grunt": "~0.4.0"
   },