Issue #2231693 by amitgoyal, iS: Update Powered by Drupal link.
Issue #2282125 by joshi.rohit100, mtift: Fixed Remove instances of '@return self'.
Issue #2246661 by ivanjaros: Some templates are missing 'Default theme implementation ..' statement.
Issue #2270815 by vijaycs85, Gábor Hojtsy, nvinayvinay: Make schema testing code available as generic API.
Issue #2216557 by jhodgdon, mongolito404, Berdir: Fill in @defgroup/topic docs for Testing overview.
Issue #2216533 by jhodgdon: Fill in topic/@defgroup docs for Entity API overview.
Issue #2216553 by jhodgdon, fago: Fill in @defgroup/topic docs for Typed Data.
Issue #2287193 by alexpott: Fixed checkConfigSchema() can fail to report errors.
Issue #2285795 by Gábor Hojtsy: Fixed Drupal 8 loads alpha2 translations instead of alpha12.
Issue #2279617 by thedavidmeister, mgifford: Fixed _filter_url_trim() should use Unicode::truncate().
Issue #2039449 by joshi.rohit100, joachim, lokapujya, Jalandhar, paulh, yaworsk: Fix docs for assertField methods in WebTestBase to describe how to skip value checking
Issue #2278541 by tim.plunkett, kim.pepper, Bojhan, EclipseGc: Refactor block visibility to use condition plugins.
        squash all the work by dawehner, pwolanin, berdir, effulgentsia, likin, and plach
        May 28 - rebase for #2267753 and #2214209 and PSR-4 and multi-load fixes
        June 14 - rebase for minor conflicts with 8.x, includes manager class split
move db_ignore_replica() to menu.inc
more form updates
another form fix
start fixing MenuTest
test and form fixes - make form element use number consistently
fix MenuCacheTagsTest
fix MenuRouterTest