Updated mediawiki/extensions
Project: mediawiki/extensions/Echo  6a3624b0e47632c7cf08e06558cc26c9afe214c3

Add web bundling function to Echo notification

* add web bundling feature
* unify event_timestamp with notification_timestamp
* remove echo_subscription
* update article_link to page_link notification with new logic
* remove duplicated function from MWDbEchoEmailBatch since it's defined in parent class

Change-Id: I2fa91c44edb020209b468fe13f894d9db3732e69