use crafatar/node-df

until adriano-di-giovanni/node-df#3 is merged
fixes #4

package.json

@@ -35,7 +35,7 @@
     "jade": "~1.11.0",
     "lwip": "~0.0.7",
     "mime": "~1.3.4",
-    "node-df": "~0.1.1",
+    "node-df": "crafatar/node-df",
     "redis": "~0.12.1",
     "request": "~2.60.0",
     "toobusy-js": "~0.4.2"