Changed shared folder from NFS to Rsync. Must faster for big Drupal site...

Making use of the new Rsync synced folders. Need Vagrant 1.5+ for this. See https://www.vagrantup.com/blog/feature-preview-vagrant-1-5-rsync.html
and
http://x-team.com/2014/04/use-drupal-vagrant-rsync-feature-to-maximize-performance/