title: Angular2 + webpack do not deploy robots.txt
body: <p>I am creating a web site with Angular2@2.1.2.
  I am using Webpack with default settings (as a dependency).</p>
  
  <p>Here is my package.json</p>
  
  <pre><code>"dependencies": {
  "@angular/common": "2.1.2",
  "@angular/compiler": "2.1.2",
  "@angular/core": "2.1.2",
  "@angular/forms": "2.1.2",
  "@angular/http": "2.1.2",
  "@angular/platform-browser": "2.1.2",
  "@angular/platform-browser-dynamic": "2.1.2",
  "@angular/platform-server": "2.1.2",
  "@angular/router": "3.1.2",
  "@ngrx/core": "1.2.0",
  "@ngrx/effects": "2.0.0",
  "@ngrx/store": "2.2.1",
  "angular2-toaster": "^1.0.1",
  "awesome-typescript-loader": "2.2.1",
  "bootstrap": "3.3.7",
  "bootstrap-select": "1.11.2",
  "eonasdan-bootstrap-datetimepicker": "4.17.42",
  "es5-shim": "4.5.9",
  "intl": "1.2.5",
  "jquery": "3.1.0",
  "moment": "2.15.1",
  "ng2-modal": "0.0.21",
  "ng2-pagination": "^0.4.1",
  "ngrx-store-logger": "^0.1.7",
  "npm": "3.9.3",
  "reflect-metadata": "0.1.8",
  "rxjs": "5.0.0-beta.12",
  "ts-helpers": "1.1.1",
  "zone.js": "0.6.25"
  },
  "devDependencies": {
  "@types/jasmine": "2.2.34",
  "angular-cli": "1.0.0-beta.19-3",
  "codelyzer": "~0.0.26",
  "core-js": "2.4.1",
  "jasmine-core": "2.5.0",
  "jasmine-spec-reporter": "2.7.0",
  "karma": "1.3.0",
  "karma-chrome-launcher": "2.0.0",
  "karma-coverage": "1.1.1",
  "karma-jasmine": "1.0.2",
  "karma-phantomjs-launcher": "1.0.2",
  "karma-remap-istanbul": "0.2.1",
  "karma-verbose-reporter": "0.0.3",
  "node-sass": "3.10.3",
  "protractor": "4.0.5",
  "ts-node": "1.3.0",
  "tslint": "3.15.1",
  "typescript": "2.0.2"
  }
  </code></pre>
  
  <p>I have added a <strong>robots.txt</strong> file in the <strong>assets/</strong> directory. I was thinking that the builder (npm build) recognizes this file and put it at the root of the application, but it does not, it is still in the assets directory.</p>
  
  <p>Do I miss something ? </p>
  
  <p>Thanks.</p>