Added domain option. Maybe fixed binary cache signing.

options/machine.nix

@@ -4,12 +4,6 @@ with lib;
 
 {
   options.machine = {
-    confPath = mkOption {
-      type = types.path;
-      description = ''
-        Path to the machines configuration.nix
-      '';
-    };
     allowUnfree = mkOption {
       type = types.bool;
       description = ''
@@ -40,6 +34,13 @@ with lib;
         The Machines HostName
       '';
     };
+    domain = mkOption {
+      type = types.str;
+      default = "localhost";
+      description = ''
+        The Machines domain name.
+      '';
+    };
     firewall = {
         allowPing = mkOption {
           type = types.bool;