Add tool to scramble KorapXML files for testing purposes

Change-Id: Ifdbaaa698a1d40ee6bb0bf6f19d030b4df74a57a
diff --git a/.gitignore b/.gitignore
index f46ff07..a00c50a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,6 +7,7 @@
 todo.org
 tools/*
 !tools/rewrite_goe_licenses.pl
+!tools/scramble_korapxml.pl
 build
 fixtures.txt
 node_modules