* Transform async functions with regenerator

Remove `transform-async-to-generator`, which to my understanding is meant
to be used in environments that support generators natively.

Because we're compiling generators to ES5 anyway, we can simply use
`regenerator` to transform async functions too, which results in
slightly simpler output and only uses the regenerator runtime instead
regenerator runtime + _asyncToGenerator Babel helper.

* Add babel-plugin-transform-regenerator

* Use dependencies with an exact version

* Make Babel config more verbose and simpler

* Support async/await

* Enable generators

* Opt out of using helpers

Fixes #31

* Use a custom eslint rule list

* Sort rules

* Relax some rules