message: Resolve shrinkwrapFile as well
diff: @@ -59,6 +59,7 @@ fs.writeFileSync(dest, fs.readFileSync(packageFile));
  var shrinkwrapFile = process.argv[5];
  if (fs.existsSync(shrinkwrapFile)) {
  + shrinkwrapFile = path.resolve(shrinkwrapFile);
  console.log('Copying npm-shrinkwrap.json to extension\'s server location...');
  fs.writeFileSync(dest, fs.readFileSync(shrinkwrapFile));
  