added test course to fix corner cases like nested numbered lists

test/simple/mod.test.yaml

@@ -0,0 +1,33 @@
+
+name:
+  en: Test Course
+
+
+#
+# nested lists seem to work in Markdown only in the US style way
+#
+# reference here: https://meta.stackexchange.com/questions/85474/how-to-write-nested-numbered-lists
+#
+# note the parser actually corrects 'Tervuren' to 3 in resulting data
+#
+
+content:
+  en: |
+    1. Dog
+
+        1. German Shepherd
+
+        2. Belgian Shepherd
+
+            1. Malinois
+
+            2. Groenendael
+
+            4. Tervuren 
+
+    2. Cat
+
+        1. Siberian
+
+        2. Siamese
+