Issue #2701085 by michaellander, george.karaivanov, Evaldas Užkuras, raman.b, S3b0uN3t, geek-merlin: Cacheable  Ajax response

Issue #2719695 by alexpott, Mile23: Fix 'Drupal.Classes.ClassDeclaration.CloseBraceAfterBody' coding standard

Issue #2665992 by alexpott, klausi, heykarthikwithu, xjm, tstoeckler: @file is not required for classes, interfaces and traits

Issue #2476407 by borisson_, hussainweb, znerol, Fabianx, Wim Leers, dawehner, Crell, Berdir: Use CacheableResponseInterface to determine which responses should be cached

Issue #2481453 by dawehner, pwolanin, rteijeiro, neclimdul, znerol: Implement query parameter based content negotiation as alternative to extensions

Issue #2068471 by dawehner, Crell, tim.plunkett, jibran, fubhy, larowlan: Normalize Controller/View-listener behavior with a Page object.

Issue #1855260 by beejeebus, msonnabaum, larowlan: Fixed Page caching broken by accept header-based routing.