ember-cli config file promise is not resolved.

[chriseppstein]

The config.search() method returns a promise, but there's no await at

https://github.com/linkedin/css-blocks/blob/master/packages/%40css-blocks/ember-cli/index.js#L285

[chriseppstein]

We should add a synchronous mode to the config module.

[abritinthebay]

on it 😄

[abritinthebay]

Note: due to that transform extensively uses Dynamic Import, making config support sync is... not likely a small task/possible as-is.