Use git HEAD hash as possible package name

Pretty simple addition to allow generating debian packages with the git
hash as part of the packages name. This may be useful for a nightly
build style for fast testing

release

@@ -24,6 +24,9 @@ do
         gen_revision_author
         git push
         exit 0
+    elif [[ $1 == '--head' ]]; then
+        REVISION=`git rev-parse HEAD`
+        shift
     else
         echo "Unknown option $1"
         exit 2