Merge pull request alibaba#363 from alibaba/remove-npm-dep

remove `npm` dependency from package.json

Author: ottomao

package.json

@@ -29,7 +29,6 @@
     "moment": "^2.15.1",
     "nedb": "^1.8.0",
     "node-easy-cert": "^1.0.0",
-    "npm": "^2.7.0",
     "pug": "^2.0.0-beta6",
     "qrcode-npm": "0.0.3",
     "request": "^2.74.0",