protect the grub interface by an invalid password hash

update version in dfs-cbox.conf
add dfs-cbox.conf to release-policy

etc-defaults.d/dfs-cbox.conf

@@ -11,7 +11,7 @@
 name = CryptoBox
 
 # Version of generated disc
-version = 0.0.1
+version = 0.3
 
 # Person that built it
 builder = sense.lab
@@ -185,7 +185,8 @@ packages = %(allpackages)s
 bootloader = grub-no-emul
 
 # Extra lines for grub config
-grubconfig = timeout 3
+grubconfig = timeout 0
+	password -md5 this_invalid_hash_protects_grub_config
 
 #####################################################################
 # Repository configuration

hints/release-policy.txt

@@ -2,6 +2,7 @@
 	- README
 	- cbox-tree.d/usr/share/cryptobox/templates/footer.cs
 	- cover/cover_[en|de].[swx|pdf]
+	- etc/defaults.d/dfs-cbox.conf (version setting)
 
 2) build image
 	- 'scripts/cbox-build.sh release'