Chown recursively synced directories (should fix #13)

Also in line with the aws plugin:

https://github.com/mitchellh/vagrant-aws/blob/169ac47e14244a17d13f7d096cfed683a849a2c1/lib/vagrant-aws/action/sync_folders.rb#L73

I think that should fix my issue I had here:

https://github.com/tknerr/vagrant-managed-servers/issues/13