Updated mediawiki/extensions
Project: mediawiki/extensions/Echo  f001382328e639b72700fbdaa751159c104b4af6

Add TargetPage model and mapper to notifications

This will be used for marking a notificaiton as read when
a user visits a target page. The new table should keep the
volume as low as possible for fast data loopup. records
should be removed from the table once it's marked as read.

Change-Id: I605cbc79adfc12d22bd889c5bb513d05c479fe6e