Create styletron plugin and styletron example

[irae]

Styleron seems to be the better CSS in JS solution out there.

https://ryantsao.com/blog/virtual-css-with-styletron
https://github.com/rtsao/styletron

It seems to be way better and more active than react-atomic-css. I think we should have an example with it and a supported plugin should be easy to write. We should also take notes if creating this integration bumps into current architecture (as it should not happen).