Michael Bradley, Jr e0f7913a02 feat: add support for embark.config.js
This commit introduces support for using `embark.config.js` to calculate the
embark configuration object that is otherwise provided via `embark.json`.

If an `embark.config.js` file is present, it will be used over the
`embark.json` file.  The `embark.config.js` module needs to export either an
object or a function that can be asynchronous and has to return or resolve with
an embark configuration object:

```js
// embark.config.js

module.exports = async function () {
  let config = ...; // do lazy calculation of `embarkConfig`;
  return config;
}
```
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