title: ng serve and ng build is not working
body: <p>I downloaded this <a href="https://github.com/yfain/primeng_seed/" rel="nofollow noreferrer" title="github repo">github project</a> . this is working fine when I am using NPM START. but when I am using <code>ng serve</code> or <code>ng build</code> this is not working.  this is giving the error:</p>
  
  <p><strong>error log</strong></p>
  
  <pre><code>Versions of @angular/compiler-cli and typescript could not be 
  determined.The most common reason for this is a broken npm install.
  Please make sure your package.json contains both
  @angular/compiler-cli and typescript in devDependencies, then 
  delete node_modules and package-lock.json (if you have one) 
  and run npm install again.
  </code></pre>
  
  <p>I tried <code>npm install @angular/cli</code> inside the project. <code>ng serve</code> still not working. what I am missing or doing wrong. here is my package.json </p>
  
  <p><strong>package.json</strong></p>
  
  <pre><code>{
  "name": "angular-seed",
  "description": "An Angular2+PrimeNG+SystemJS seed project",
  "private": true,
  "scripts": {
    "start": "live-server"
  },
  "dependencies": {
    "@angular/common": "^2.0.0",
    "@angular/compiler": "^2.0.0",
    "@angular/core": "^2.0.0",
    "@angular/forms": "^2.0.0",
    "@angular/http": "^2.0.0",
    "@angular/platform-browser": "^2.0.0",
    "@angular/platform-browser-dynamic": "^2.0.0",
    "@angular/router": "^3.0.0",
    "core-js": "^2.4.0",
    "font-awesome": "^4.6.3",
    "ngx-bootstrap": "^1.7.1",
    "primeng": "^1.0.0-beta.17",
    "rxjs": "5.0.0-beta.12",
    "systemjs": "0.19.37",
    "zone.js": "0.6.21"
  },
  "devDependencies": {
    "@angular/cli": "^1.5.0",
    "live-server": "1.1.0",
    "typescript": "^2.0.0"
  }
  }
  </code></pre>