Drop unused dependencies

Author: dignifiedquire

package.json

@@ -9,10 +9,7 @@
     "multiaddr": "^1.0.0",
     "multipart-stream": "^2.0.0",
     "superagent": "^1.4.0",
-    "superagent-logger": "^1.0.3",
-    "vinyl": "^0.5.1",
-    "vinyl-fs-browser": "^2.1.1-1",
-    "vinyl-multipart-stream": "^1.2.6"
+    "superagent-logger": "^1.0.3"
   },
   "browserify": {
     "transform": [