Feature, classes, use relative reference

Change-Id: I1942580e78d3c9e83fdad4927532186441fe3298
diff --git a/test/model/extensions/classes/relative/init.yml b/test/model/extensions/classes/relative/init.yml
new file mode 100644
index 0000000..117e4fa
--- /dev/null
+++ b/test/model/extensions/classes/relative/init.yml
@@ -0,0 +1,3 @@
+
+classes:
+  - .nested