title: ionic serve cannot find module 'reflect-metadata'
body: <p>i have just started ionic2 :</p>
  
  <pre><code>$ npm install -g ionic cordova
  $ ionic start cutePuppyPics --v2
  $ cd cutePuppyPics
  $ ionic serve
  </code></pre>
  
  <p>i have this error : cannot find module 'reflect-metadata'</p>
  
  <pre><code>$ ionic info 
   ordova CLI: 6.5.0
  Ionic Framework Version: 2.2.0
  Ionic CLI Version: 2.2.1
  Ionic App Lib Version: 2.1.7
  Ionic App Scripts Version: 1.1.4
  ios-deploy version: Not installed
  ios-sim version: Not installed
  OS: Windows 8.1
  Node Version: v7.7.2
  Xcode version: Not installed
  </code></pre>
  
  <p>i try also <code>npm update -g</code> , but not work 
  <code>npm -v</code> : 2.15.11
  <code>ionic -v</code> 2.2.1</p>