Update compatibility of node.js versions
Update compatibility of node.js versions

* Remove old node.js versions as their versions of npm are not
  compatible with eslint-config-ftgp
  https://github.com/eslint/eslint/issues/3458#issuecomment-132921218

* Add node.js 7

foretagsplatsen/objectjs,foretagsplatsen/klassified,foretagsplatsen/klassified,foretagsplatsen/objectjs