Adding default `fileType` config for `js` files re #128

The shared regex variable is mostly a refactor for reuse and wasn't in the original proposal.
We obviously need more commas in here.

I'm not sure that we would need references to CSS files inside of a JavaScript file, but hey, it could happen!
It should work for `js` files. No, really.
Create index-actual.js
Create index-expected.js
Thought to include a comment that might break...
NEED MORE COMMMAS

I'm really good at JavaScript. I teach it every day. >_<
Took some monkeying...
Merge pull request #129 from al-the-x/patch-1

Add default `fileType` config for `js` files re #128