.febuild should be a JS file

[quicoto]

The configuration defined on .febuild is JS, for instance:

module.exports = {
  general: {
      defaultTasks: [ "styles", "webpack" ],
  }
}

Yet the file has no .js extension. Thus, not taking advance or code highlight or linting.

Can we make it a JavaScript file instead?

[quicoto]

@easingthemes @raohmaru Thoughts?

[raohmaru]

Although you can manually define the language of a file in any modern IDE, this proposal does not hurt. Notwithstanding I would keep the support for plain .febuild files for backwards compatibility.

[easingthemes]

I like .febuild, it gives something unique to this library :).
But of course we can support both. Should not be that complex change.