Updated mediawiki/extensions
Project: mediawiki/extensions/Flow  73840cc7a731b588048531dbbe2ed62af106e5c0

Third level of nesting

* Notifications already work fine; every reply descendant of one of your posts,
  will trigger a notification
* Fixed a bug with the reply form (could trigger multiple forms on # levels)

Change-Id: Id2f63dc281d9495144013ba28df019f9e84531d1