fix duplicate script object

Author: localjo

package.json

@@ -20,7 +20,8 @@
     "url": "https://github.com/solidusjs/devtools-solidus/issues"
   },
   "scripts": {
-    "test": "grunt test"
+    "test": "grunt test",
+    "postinstall": "node_modules/.bin/bower install"
   },
   "devDependencies": {
     "grunt": "~0.4.5",
@@ -31,8 +32,5 @@
   "dependencies": {
     "bower": "^1.3.6",
     "socket.io-client": "^1.0.6"
-  },
-  "scripts": {
-    "postinstall": "node_modules/.bin/bower install"
   }
 }