systemd: Update to 216
systemd: Build manpages
systemd: Drop unnecessary dependency
NixOS containers: Use exit status 133 for reboots
Doh
Enable systemd's mymachines NSS module

It makes every local container registered with machined resolvable.
polkit: Add docbook DTD
Merge remote-tracking branch 'origin/master' into systemd-216
Do not assert absolute path for nodev grub device. Closes #3996
haskellPackages.twitterConduit: Update to 0.0.5.8 and remove 'broken' flag
Fix Nixpkgs evaluation

error: attribute `luaversion' missing, at /home/eelco/Dev/nixpkgs/pkgs/development/interpreters/lua-5/expat.nix:16:34
Merge remote-tracking branch 'origin/systemd-216' into staging