Merge branch 'release-1.20'
install rsync and symlink /vagrant
added README-rsync.md
vagrant-windows is not needed now that 1.6 required
Merge pull request #93 from brettporter/update-readme

vagrant-windows is not needed now that 1.6 required
enable RDP after installation

Need to open the right port in the firewall, and to turn on remote desktop
(terminal services) in the registry
Merge pull request #94 from brettporter/enable-rdp

enable RDP after installation
Merge pull request #90 from StefanScherer/install_rsync

Install rsync