message: Use `originalError` if present in ng2 example
  `originalError` is not present for failed Promises caught by zone (example[(http://plnkr.co/edit/9M2jYlsLykjXUkDnI0E7)])
diff: @@ -69,7 +69,7 @@ Then, in your main module file (where ``@NgModule`` is called, e.g. app.module.t
  export class RavenErrorHandler implements ErrorHandler {
  handleError(err:any) : void {
  - Raven.captureException(err);
  + Raven.captureException(err.originalError || err);
  }
  }
  