# File lib/facets/core/fileutils/compress.rb, line 87
  def zip( folder, to_file=nil )
    to_file ||= File.basename(File.expand_path(folder)) + 'tar.bz2'
    cmd = "zip -cf #{to_file} #{folder}"
    puts cmd
    system cmd
    return File.expand_path(to_file)
  end