[dist] Test runner depends on async

Author: mmalecki

package.json

@@ -22,6 +22,7 @@
   "devDependencies": {
     "request": "1.9.x",
     "vows": "0.5.x",
+    "async": "0.1.x",
     "socket.io": "0.6.x"
   },
   "main": "./lib/node-http-proxy",