Support ESLint YAML and JS config.

[lijunle]

Document: http://eslint.org/docs/user-guide/configuring#configuration-file-formats

[goloroden]

This is implemented by #173

[marcjordan]

I don't believe #173 is opening and reading 'package.json' as one of the allowed filenames. Can we get this or #154 re-opened?

[lijunle]

Re-opened.

Hey, @marcjordan I am sorry that, I really don't have time to continue working on this project. If you are interested in fixing these issue, please tell me and I will loop you as contributors.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[VincentLanglet]

@rumpl This can be closed c.f. https://github.com/depcheck/depcheck/blob/master/src/special/eslint.js