title: Cannot read property 'call' of undefined - Angular2 webpack example
body: <p>I'm running through the Angular2 webpack sample app at <a href="https://angular.io/docs/ts/latest/guide/webpack.html" rel="nofollow">https://angular.io/docs/ts/latest/guide/webpack.html</a> </p>
  
  <p>I've just finished the "Development Configuration" section and I've attempted the "try it out" by copying in the app at the bottom of the page and calling npm start, however all I see is the "loading" and I get "Cannot read property 'call' of undefined" at polyfills.js 1 in the console. </p>
  
  <p>I've gone back through the files and copy/pasted everything in directly in case of a typo. I also tried pushing the requires for zone up as far as I could in polyfills.ts due to the warnings about it in the tutorial. </p>
  
  <p>I'd appreciate any suggestions as to what the problem could be or even if somebody else could attempt to get the app running at this point ( I've skipped the production and testing since it seems like you should be able to run the app at this point )  </p>
  
  <p>I've put a copy of my site so far at <a href="https://github.com/Liam-Ryan/Angular2WebpackSite" rel="nofollow">https://github.com/Liam-Ryan/Angular2WebpackSite</a></p>