Merge "Pass $key into CommentStore methods and use MediawikiServices"

diff --cc RELEASE-NOTES-1.31
Simple merge

diff --cc includes/ServiceWiring.php
Simple merge

diff --cc includes/Storage/RevisionStore.php
Simple merge

diff --cc includes/Title.php
Simple merge

diff --cc includes/api/ApiQueryBase.php
Simple merge

diff --cc tests/phpunit/includes/RevisionTest.php
Simple merge

diff --cc tests/phpunit/includes/Storage/RevisionStoreTest.php
Simple merge