moved grunt into production dependencies

package.json

@@ -22,7 +22,14 @@
     "primus": "3.2.1",
     "primus-emit": "0.1.2",
     "primus-spark-latency": "0.1.1",
-    "ws": "0.8.1"
+    "ws": "0.8.1",
+    "grunt": "^0.4.5",
+    "grunt-contrib-clean": "^0.6.0",
+    "grunt-contrib-concat": "^0.5.1",
+    "grunt-contrib-copy": "^0.8.0",
+    "grunt-contrib-cssmin": "^0.12.3",
+    "grunt-contrib-jade": "^0.14.1",
+    "grunt-contrib-uglify": "^0.9.1"
   },
   "repository": {
     "type": "git",
@@ -41,12 +48,5 @@
   ],
   "license": "LGPL-3.0",
   "devDependencies": {
-    "grunt": "^0.4.5",
-    "grunt-contrib-clean": "^0.6.0",
-    "grunt-contrib-concat": "^0.5.1",
-    "grunt-contrib-copy": "^0.8.0",
-    "grunt-contrib-cssmin": "^0.12.3",
-    "grunt-contrib-jade": "^0.14.1",
-    "grunt-contrib-uglify": "^0.9.1"
   }
 }