Updated mediawiki/extensions
Project: mediawiki/extensions/BayesianFilter  3a9879c2ee63a932a037046affe576fa8ffd0ad9

fixed the column name, added a hook LoadExtensionSchemaUpdate, fixed the
join condition in dbHandler

Change-Id: I73ca6d13a150141e339962d8d1bb8fe42f6a7d31