preloads original configure_networks.rb to actually perform the monkey patching
increases boot wait time just in case
uses the beta channel to install CoreOS
rollback provisioning of fig to happen in Packer again
fixes NFS mounts: rpc-statd.service was disabled and broken

reference: https://github.com/coreos/coreos-overlay/issues/684
pulls proxy image while provisioning
documents caveats of only support NFS and RSync
setups some nice defaults for private_network and memory