polymer.json

{
  "shell": "build.html",
  "extraDependencies":[
    "bower_components/vaadin-progress-bar/**"
  ],
  "sources":[

  ],
  "builds": [
    {
      "name": "production",
      "js": {"compile": false, "minify": true},
      "css": {"minify": true},
      "sourceMaps":true,
      "html": {
        "minify": true
      },
      "stripComments":true
    }
  ]
}