ES6 Modules loader

[slyg]

Continuation of https://github.com/viadeo/node-maglev-app/issues/1

[tregagnon]

I spent some time looking at Brunch and Webpack.

I am convinced by Brunch, and would like try it on viadeo-webapp when you are available @slyg.

Webpack is the new cool kid in the block. I see many shared features with Brunch. Only some advanced features put Webpack on top of Brunch. But I don't think we need them right now. Code splitting with Async loading is not something we are ready for. Webpack is supposed to be better at isomorphic code, but I think we would need a lot more work to get this started.
The deduplication of used modules is nice. But I think Brunch knows how to do it.

Our problems with the current Grunt build are:

• Slow build time
• Slow updating on watch
• Complex Grunt tasks to support our build needs

Brunch is designed to tackle these issues. And this repository begs to be tried on the viadeo-webapp. 😉