Updated mediawiki/extensions
Project: mediawiki/extensions/Echo  e6d9e93393c88832a1232f1fdeddce2691db00ec

Getting rid of confusing abstraction regarding formatter classes

Specifying the class directly is much less confusing and fragile.
Plus we have way too many things named 'type'.
Also changing MWEchoArticleLinkedFormatter to EchoArticleLinkedFormatter
to match the convention of the other formatter classes.
Also making EchoBasicFormatter the default, so that the Hello World
case is easier to implement.

Change-Id: Ibd9b15008d37ad815e466ab81ba9a5b668ee2791