node-sass-js-importer

Reactivate this package, mostly due issues with node-sass-json-importer.

• Use path.dirname() instead of custom implementation, closes #4 a9d346b
• Update Node.js versions for Travis 25f1ce3

https://github.com/Loilo/node-sass-js-importer/compare/v4.0.1...v4.0.2

BREAKING CHANGE:

• Drop support for Node.js v5

Also there are various development focused changes (ignited by a harsh npm audit report):

• Update and clean up dependencies
• Replace .npmignore with explicit files field
• Add engines field to package.json
• Improve .gitignore
• Sort package.json
• Remove yarn.lock