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

Issue #2666650 by alexpott, benjy: Inject migration and source plugin managers into the migration plugins

Issue #2676222 by alexpott, johnrosswvsu: Move MigrationInterface out of the migrate\Entity namspace now they are plugins

Issue #2625696 by chx, benjy, alexpott, catch, mikeryan, andypost, phenaproxima: Make migrations themselves plugins instead of config entities

Issue #2281691 by xjm, mikeryan, Gábor Hojtsy, alexpott, tim.plunkett, webchick, abhishek-anand, quietone, yoroy, stevepurkiss, benjy, Bojhan, Ryan Weal, aleksip, anavarre, hussainweb, er.pushpinderrana, cilefen, Luukyb, Jo Fitzgerald: User interface for migration-based upgrades

Revert "Issue #2625696 by chx, alexpott, benjy, mikeryan, andypost, phenaproxima: Make migrations themselves plugins instead of config entities"

This reverts commit 694994fe.

This reverts commit f71ec898.

Issue #2625696 by chx, alexpott, benjy, mikeryan, andypost, phenaproxima: Make migrations themselves plugins instead of config entities

Issue #2676346 by alexpott, dawehner: Coding standards check on DB dump fixtures causes PHPCS to out of memory on PHP5.5 and is slow cause of huge files

Issue #2226455 by quietone, ultimike, brockfanning: Migrated URL aliases not working until nodes are re-saved

Issue #2604484 by quietone, dobe, drclaw, skyredwang, mikeryan, grahl: Migrate Drupal 7 image and file fields

Issue #2503047 by svendecabooter, phenaproxima, quietone, mikeryan: Migrate the D6/D7 actions table to D8

Issue #2590993 by mikeryan, webflo, svendecabooter, dixon_, phenaproxima: Create stub entities with proper default values

Issue #2324649 by phenaproxima, svendecabooter, benjy, Berdir: Migrate text fields correctly based on their text_processing setting

Issue #2588827 by phenaproxima, neclimdul, svendecabooter, benjy, mikeryan: CCK migrations seem to have trouble with some checkbox types

Issue #2594263 by phenaproxima, neclimdul, Gábor Hojtsy, Kazanir: Add translation data to Migrate Drupal's test fixtures

Issue #2560637 by phenaproxima, benjy, quietone, mikeryan, chx, neclimdul: Improve handling of uid 1 during migration

Issue #2429191 by claudiu.cristea, amateescu, yched, nlisgo, Berdir, alexpott, klausi, Wim Leers, xjm, catch: Deprecate entity_reference.module and move its functionality to core

Issue #2561697 by phenaproxima, anavarre, Jeremy: Migration should not choke when the content_node_field table isn't available