debhelper addon to build Node.js modules

 dh-nodejs provides debhelper files (set dh-sequence-nodejs into build
 dependencies) to automatically:
  * read lerna.conf "packages" field if exists and/or "workspaces" field from
    package.json
  * link or copy needed modules into node_modules/ directory
  * automatically build package and components when build system is
    recognized
  * launch test
  * choose files to install
  * build "Provides" value for package with components
  * build pkgjs-lock.json files and "XB-Javascript-Built-Using" value for
    packages built with webpack/browserify
  * clean all its stuff during dh_auto_clean step