message: update polyserver to 0.19.0
diff: "mocha": "^3.1.2",
  "multer": "^1.1.0",
  "nomnom": "^1.8.1",
  - "polyserve": "^0.17",
  + "polyserve": "^0.19.0",
  "promisify-node": "^0.4.0",
  "resolve": "^1.0.0",
  "semver": "^5.3.0",
  