Merge recent master into staging

Nixpkgs Hydra: ?compare=1157272

TODO: port e22889064f

Conflicts:
	nixos/tests/gnome3_10.nix (auto-solved)
	pkgs/applications/video/aegisub/default.nix
	pkgs/development/libraries/boost/1.55.nix

nixos/modules/virtualisation/amazon-image.nix

@@ -191,10 +191,5 @@ in
     environment.systemPackages = [ pkgs.cryptsetup ];
 
     boot.initrd.supportedFilesystems = [ "unionfs-fuse" ];
-
-    # Prevent logging in as root without a password.  This doesn't really matter,
-    # since the only PAM services that allow logging in with a null
-    # password are local ones that are inaccessible on EC2 machines.
-    security.initialRootPassword = mkDefault "!";
   };
 }

nixos/modules/virtualisation/docker-image.nix

@@ -38,8 +38,8 @@ in {
     '';
 
 
-  # docker image config
-  require = [
+  # Docker image config.
+  imports = [
     ../installer/cd-dvd/channel.nix
     ../profiles/minimal.nix
     ../profiles/clone-config.nix
@@ -47,16 +47,16 @@ in {
 
   boot.isContainer = true;
 
-  # Iptables do not work in docker
+  # Iptables do not work in Docker.
   networking.firewall.enable = false;
 
   services.openssh.enable = true;
 
-  # Socket activated ssh presents problem in docker
+  # Socket activated ssh presents problem in Docker.
   services.openssh.startWhenNeeded = false;
 
-  # Allow the user to login as root without password
-  security.initialRootPassword = "";
+  # Allow the user to login as root without password.
+  users.extraUsers.root.initialHashedPassword = mkOverride 150 "";
 
   # Some more help text.
   services.mingetty.helpLine =