React & Webpack tutorial needs update

[LiangZugeng]

Hi,

As a new comer to TypeScript, I'm following the React & Webpack tutorial to create a basic React sample application ([http://www.typescriptlang.org/docs/handbook/react-&-webpack.html]), but I didn't get through, there are several issues:

1. The webpack version got updated from the one on which this tutorial was written, now it's 2.2.1 and the module.preLoaders in webpack.config.js doesn't work anymore, and webpack didn't like the empty element "" in resolve.extensions array.

2. The project structure is not clearly laid out, as a freshman I can't even figure out in which directories package.json/webpack.config.js/tsconfig.json files go.

If someone can update this tutorial and make it work, that will greatly help someone like me getting started with TypeScript. Thank you.