Write zeros to disk to improve disk compression

Write zeros to a file on the root partition until the filesystem is
full, then unlink the file. Packer will compress the disk as part of
the build, resulting in smaller final disk image.

I also enabled headless for future headless builds on a buildserver

Vmware support

Fix the building proccess

Remove header/dkms (Closes #4)

Setting up authorization rule for Polkit

Use Virtualbox guest kernel modules for Arch Kernel (virtualbox-guest-modules-arch).

This commit fixes the 'file not found: `fsck.btrfs''-Error during
system upgrade.

added polkit to pacstrap for systemctl poweroff, added sudo to poweroff
command, moved link for systemd-resolved to postinstall.sh

added new postinstall.sh, moved the controllers to postinstall.sh and added the script to vagrant.json