Make Node.js and npm version requirements less strict

Author: agdl

examples/node_test_server/package.json

@@ -9,9 +9,5 @@
     "express": ">=4.0.0",
     "multer": "*",
     "ws": "^1.1.1"
-  },
-  "engines": {
-    "node": "0.10.x",
-    "npm": "1.3.x"
   }
 }