Issue #2067915 by eatings, kjay, bserem: Restore html attributes to maintenance-page.html.twig.
Issue #2093217 by justinchev: Update Seven's description.
Issue #731724 followup by berdir, chx: HEAD BROKEN due to Convert comment settings into a field to make them work with CMI and non-node entities
Issue #2098661 by webflo: Provide config schema for Config test entity.
Issue #2097259 by vijaycs85, tstoeckler: Add hasConfigSchema() method.
Issue #2083615 by Gábor Hojtsy, YesCT, tim.plunkett, Schnitzel: Use links annotation for config entity URI like for content entities.
Issue #2057401 by plach, socketwench, kfritsche: Fixed Make the node entity database schema sensible.
Revert "Issue #2057401 by plach, socketwench, kfritsche: Fixed Make the node entity database schema sensible."

Completely wrong commit message. :P Oops. :P

This reverts commit 1426a57883d6cf76a8d5b2fc6bda2b9fe7b3873b.
Issue #2019087 by dropfen, gobilo: Complete Configuration schemas for views relationship.
Issue #2029767 by Mark Conroy, batigolix, kscheirer: Create hook_help() for history module.
Issue #2051923 by Berdir, dixon_, plach: Rename \Drupal\Core\Entity\Field\Field, related subclasses and interfaces to *FieldItemList.
Issue #2051923 follow-up by andypost: Remaining clean-up from renames.
Issue #2051923 follow-up by smiletrl: More rename clean-up.
Issue #1839318 by JohnAlbin, echoz: Added Replace drupal.base.css library with normalize.css for all themes.
Issue #2086305 by larowlan: Add a FloatItem data type.
Issue #1327224 by Berdir, ryanissamson, johnv, chris.leversuch, edb, nyirocsaba: Fixed Access denied to taxonomy term image.
Issue #1606110 by greenrover33, nod_: Fixed Exception thrown in collapse.js by .after(' ') breaks CKEditor display in term edit pages.
Issue #2087917 by damiankloip: Convert AjaxCommandsUnitTest to PHPUnit.
Issue #2087637 by mondrake: Add a drupalProcessAjaxResponse() method.
Issue #2083721 by benjy, longwave: 'block_body()' field could be renamed 'body'.