* Script to build Debian package
* Adjustments for Debian scripts:
- Add copyright file
- Add full description to control file
- Ignore some lintian rules
- Delete clowny files that aren't needed and break lintian rules
- Update shebang in yarn.js from "node" to "nodejs" as per Debian package of Node
* Add basic Debian instructions
* Revert readme change and explicitly require Node.js 4 or above