Figure out Lerna + bundledDependencies

[gaearon]

I have a feeling Lerna publish might be messing with our bundledDependencies.
Compare:

• Before Lerna: https://unpkg.com/react-scripts@0.4.3/node_modules/
• After Lerna: https://unpkg.com/react-scripts@0.5.0/node_modules/

This may be just the monorepo transition, I’m not sure.
I think we need some more solid way of bundling as much stuff as we can.
Maybe we should just bundle everything instead of direct dependencies before publish.

cc @fson

[gaearon]

Oh wait. That looks like unpkg had a glitch, the files appeared now.

[fson]

Everything seems to work now.