pam: Add logFailures option for adding pam_tally to su
nixos: add systemd service for getty on /dev/console
nixos: make-system-tarball, add option for extra arguments for tar

Sometimes extra arguments when making tarball are required,
for example if making a container owner of files has to be changed
to root.
nixos: virtualisation, add basic docker nixos image
btrfsProgs: 3.14.2 -> 3.16.0

Additionally, add myself as a maintainer.
backintime: Definition improvement
Merge pull request #3902 from DamienCassou/backintime

backintime: Definition improvement
Merge pull request #2644 from lethalman/pam_tally

pam: Add logFailures option for adding pam_tally to su
Merge pull request #3876 from wkennington/master.btrfsProgs

btrfsProgs: 3.14.2 -> 3.16.0
Merge pull request #3779 from offlinehacker/docker

full nixos inside docker