Mike frontend

All but the last are the default values (https://github.com/webpack/docs/wiki/configuration#resolveextensions).

The beauty here is that:
* You still get to `import`+`require` your `.ts` files without having to specify their extension.
* You still get to build your `.ts` files with your IDE (`webpack` stops the resolving "attempts" when it finds a match using the many module paths/extensions combinations, so it would stop at `something.js` in that case)
* I still get to compile the front-end `.ts` files (since the `.js` file won't resolve to anything) without having to specify the `.ts` extension either. The reason for this is the same as pointed before, the way the TS integration is done in T3S (for the time being anyway), is that it will build a TS dep-tree by traversing the root towards the leaves. Hence, the definition files and front-end assets don't get picked up in that case.