       ).join('')
       contents = sqwish.minify contents if @mode is 'production'
       fingerprint = '-' + fingerprintForPkg('css', pkg)
-      filename = "#{pkg}.css"
+      filename = "#{pkg}-#{ts}.css"
       writeFile filename, contents, (err) =>
         if @gzip then gzipPkg(contents, filename, callback) else callback()
         total++

# Runs through all of the asset packages. Concatenates, minifies, and gzips them. Then outputs
# the final packages. (To be run once during the build step for production)

module.exports.package = (callback = ->) =>

  clearAssetsDir()


      contents = (contents for fn, contents of preprocessPkg pkg, 'js').join(';\n')
      contents = uglify contents if @mode is 'production' and @minify
      fingerprint = '-' + fingerprintForPkg('js', pkg)
      filename = "#{pkg}-#{ts}.js"
      writeFile filename, contents, (err) =>
        if @gzip then gzipPkg(contents, filename, callback) else callback()
        total++
