Override version during nightly builds

package.sh

@@ -238,6 +238,11 @@ if [ -z "$NIGHTLY_BUILD" ]; then
        update_tree
        check_tag_exists $VERSION
 fi
+
+if [ -n "$NIGHTLY_BUILD" ]; then
+    commit=`git rev-parse HEAD`
+    VERSION=$VERSION-nightly-$commit
+fi
 do_build $VERSION
 make_dir_tree $TMP_WORK_DIR $VERSION