Move loader to dev dep

ui/package.json

@@ -70,6 +70,7 @@
     "postcss-reporter": "^1.3.1",
     "precss": "^1.4.0",
     "react-addons-test-utils": "^15.0.2",
+    "resolve-url-loader": "^1.6.0",
     "sass-loader": "^3.2.0",
     "sinon": "^1.17.4",
     "sinon-chai": "^2.8.0",
@@ -99,7 +100,6 @@
     "react-sparklines": "^1.4.2",
     "redux": "^3.3.1",
     "redux-thunk": "^1.0.3",
-    "resolve-url-loader": "^1.6.0",
     "updeep": "^0.13.0"
   }
 }