Need to support require.resolve()

[jurassix]

Add support for require.resolve() since these can be relative paths.

[ahutchings]

Might be able to knock jurassix/atom-javascript-refactor#24 out with this, too.

[jurassix]

Yeah I'm seeing the same thing with .css. create-react-app using css file imports from JS, we should preserve refs when the css files move.

[jurassix]

Also I'm seeing imports of .svg files too. These should preserve when moving them.

[jurassix]

Because of the following possible whitelist, I'm just going to open this up 💃 to anything.

1. .json
2. .css
3. .(jpg|jpeg|png|gif|eot|otf|webp|svg|ttf|woff|woff2|mp4|webm|wav|mp3|m4a|aac|oga)
4. .jsx
5. .react.js

[jurassix]

Update. I'm down to a single failing scenario. I should resolve it soon.