Update babel plugins

[pioug]

Doing some chores and updating the Babel tooling.

I also noticed there is a .babelrc (used by npm run build|watch I think) and Babel configurations for npm run dist-dev|dist-watch).

Maybe we can keep a single configuration in .babelrc to make it simple. What do you think?

[aadsm]

I don't remember exactly why I put the babel configuration in the package.json directly for the dist-* scripts. I'd be happy to have everything in .babelrc.

Thanks!

[pioug]

Thanks for the info! I move all Babel config to .babelrc.

[aadsm]

Merged!