Updated mediawiki/extensions
Project: mediawiki/extensions/PubSubHubbub  f31e5b23546a0fd914e23ecb0942d8bbecfdf514

Inserted prefix for special page name.
Fix count in testOnNewRevisionFromEditComplete.

Change-Id: I9a5df39acda1f3a5770bb317a4791ddf609bd02d