Package plugins with vagrant

Vagrantfile

needs_restart = false
plugins = {
  'vagrant-aws' => '0.5.0',
  'vagrant-s3auth' => '0.1.0',
  'vagrant-bindfs' => '0.3.2',
}
plugins.each do |plugin, version|
  unless Vagrant.has_plugin?(plugin)
    system("vagrant plugin install #{plugin} --plugin-version #{version}") || exit!
    needs_restart = true
  end
  exit system('vagrant', *ARGV) if needs_restart
end