docker: update to 1.0.0

If you need systemd support you have to apply this patch http://pastebin.com/nU7fBPrd and add 

```
    docker = overrideDerivation pkgs.docker (p: {
      patches = [ ./docker_systemd.patch ];
    });
```

to your `~/.nixpkgs/config.nix`. Wil be upstream in next release :)