Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  583caf2081e24e178ba3574a056fc8546e4ba271

Make travis test against php 5.6 and hhvm

Currently allow HHVM to fail as, well, it fails...

Change-Id: Idb250d7249361ee767fb8302d8506a54b43a1b23