[dist] Use devDependencies in package.json

package.json

@@ -16,8 +16,11 @@
   "dependencies": {
     "colors": ">= 0.5.x",
     "optimist": ">= 0.1.x",
-    "request": ">= 1.9.x",
-    "vows": ">= 0.5.x"
+    "request": ">= 1.9.x"
+  },
+  "devDependencies": {
+    "vows": ">= 0.5.x",
+    "socket.io": ">= 0.6.x"
   },
   "main": "./lib/node-http-proxy",
   "bin": { "node-http-proxy": "./bin/node-http-proxy" },