Issue #2822382 by voleger, pfrenssen, erozqba, RytoEX, borisson_, sidharthap, Jo Fitzgerald, shashikant_chauhan: Make every  property protected on classes extending BrowserTestBase and KernelTestBase

Issue #2729369 by quietone, Jo Fitzgerald, maxocub, mikeryan, heddn: Remove support for migrating temporary files

Issue #2960611 by msankhala, dmitryl, benjifisher: Change lookupSourceID and lookupDestinationID to lookupSourceId and lookupDestinationId in the Migrate module

Issue #2597680 by stimalsina, neclimdul, paryank, Derimagia, timodwhit, Dries, vinothg, heddn, benjy, effulgentsia: Some migrations have warnings when node types don't exist

Issue #2826047 by heddn, Jo Fitzgerald, mikeryan, catch, alexpott: 6-8 user picture migration must create new fids, which can conflict with fids used by other migrations

Issue #2854529 by alexpott, xjm, klausi, Chi, Mixologic: Fix Drupal.Scope.MethodScope - all methods should have scopes

Issue #2776975 by joelpittet, dawehner, tim.plunkett, xjm, pfrenssen: March 3, 2017: Convert core to array syntax coding standards for Drupal 8.3.x RC phase

Issue #2695297 by mikeryan, ohthehugemanatee, quietone, vasi, Sharique, chx, benjy, phenaproxima, heddn, benjifisher: Refactor EntityFile and use process plugins instead

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