Feature: className on compilation

[gtournie]

@Ximik Nice plugin.
I added className resolution during compilation on my repo:
https://github.com/gtournie/babel-plugin-transform-jsx-bemed

Feel free to report my changes to your repo.

[Ximik]

@gtournie Hello, thank you. I've checked through your code, it seems like a great idea for me.

This plugin was developed for the frontend with huge theme customisation requests (so it was impossible to use standard css-modules solutions). However the company changed the product requirements and the plugin has never seen the production :(

So it's very raw and I remember some issues during testing. That's why I want to have some unit tests before having any pull requests. Hopefully, I will find some time to do them (I'm also thinking about using this plugin for my current job).

Thank you for your code and feedback.

UPD: Just noticed, there are unit tests :D I will refresh everything in my memory, recheck and ask you for PR then.