Updated mediawiki/extensions
Project: mediawiki/extensions/Flow  13bd07025f32a05513ac18921d902bf2e2820d9f

Wire up the buffered cache to db transactions

Make transaction usage for commiting changes explicit.  At the same
time wire up BufferedCache to only write to memcached when db
transaction completes.

The TreeRepository uses BagOStuff instead of BufferedCache, this
still needs to be fixed for the cache to stay consistent.

Change-Id: Iba2ce9c2e87164f8f54ac29b58f92895da2e24b6