title: Module not found: Error: Can't resolve 'hammerjs'
body: <p>I updated my Angular 2 CLI project from <code>1.0.0-beta.11-webpack.2</code> to <code>1.0.0-beta.11-webpack.8</code> via <code>ng init</code>. My project uses Angular <code>2.0.0-rc.5</code> and Angular Material <code>2.0.0-alpha.7-4</code> but when run with <code>ng serve</code> I get the following error:</p>
  
  <pre><code>ERROR in ./src/app/app.module.ts
  Module not found: Error: Can't resolve 'hammerjs' in '/home/jan/src/fm-repos/fm-ui/src/app'
   @ ./src/app/app.module.ts 38:0-18
   @ ./src/app/index.ts
   @ ./src/main.ts
   @ multi main
  
  ERROR in [default] /home/jan/src/fm-repos/fm-ui/node_modules/@angular2-material/core/gestures/MdGestureConfig.d.ts:4:39 
  Cannot find name 'HammerManager'.
  
  ERROR in [default] /home/jan/src/fm-repos/fm-ui/node_modules/@angular2-material/slide-toggle/slide-toggle.d.ts:67:19 
  Cannot find name 'HammerInput'.
  
  ERROR in [default] /home/jan/src/fm-repos/fm-ui/node_modules/@angular2-material/slider/slider.d.ts:50:19 
  Cannot find name 'HammerInput'.
  
  ERROR in [default] /home/jan/src/fm-repos/fm-ui/node_modules/@angular2-material/slider/slider.d.ts:52:24 
  Cannot find name 'HammerInput'.
  </code></pre>