chore(package): update rimraf to version 2.5.1

http://greenkeeper.io/

package.json

@@ -41,7 +41,7 @@
     "less-loader": "~2.2.0",
     "map-json-webpack-plugin": "~1.1.0",
     "postcss-loader": "~0.8.0",
-    "rimraf": "~2.5.0",
+    "rimraf": "~2.5.1",
     "url-loader": "~0.5.6",
     "webpack": "~1.12.2"
   },