Issue #2096595 by neclimdul, damiankloip, tim.plunkett, Mile23, ParisLiakos: Make all PHPUnit tests pass with --strict.

Issue #2080401 by Bladedu, mrsinguyen, lokapujya, pfrenssen: Remove Unused local variable  from /core/modules/simpletest/lib/Drupal/simpletest/Tests/SimpleTestTest.php.

Issue #1798732 by sun, Dean Reilly, mbrett5062, chx, westie, alexpott, juanolalla, Mark Carver, catch, jthorson, cam8001, Berdir: Convert install_task(), install_time() and install_current_batch() to use the state system.

Issue #2100329 by cosmicdreams: Use \Drupal instead of Drupal to make IDEs and static code analyse tools happy.

Issue #1587270 by klausi: Added comment in .htaccess describing how to forbid execution of PHP files in subfolders.

Issue #2025883 by iamEAP, Mile23, msonnabaum, Berdir: Fixed Drupal's PHPUnit bootstrap.php does not register module namespaces out of /core.

Issue #1872598 by LewisNyman, rachel_norfolk, echoz, djbobbydrake: Fixed Bartik color settings not responsive.

Issue #2086201 by tim.plunkett, pwolanin: Fixed Use PluginFormInterface instead of one-off form methods for search plugins.

Issue #1387964 by yoroy, themic8, realityloop, galooph: Fixed People miss the first section of the help overview page.

Issue #2102539 by andypost: Fixed Current user service should be updated in drupalLogin() and drupalLogout().

Issue #2049167 by jbrown: Fixed Don't use function_exists() on functions that are built into PHP 5.3.

Issue #1901390 by chx, sun: Enable StaticReflectionParser performance optimization to speed up Annotation parsing.

Issue #2040269 by Tim Bozeman, RunePhilosof, typhonius, Cottser: Remove drupal_add_css() from bartik.theme.

Issue #2103231 by Mark Carver: Add Mark Carver to the list of theme system maintainers in MAINTAINERS.txt.

Issue #1106160 by tim.plunkett, BarisW: Fixed Color module uses the public file system but doesn't check if it is set.

Issue #2095641 by m1r1k: Use current_user() service instead of _account attribute to get user object.

Issue #2006282 by joelpittet: Refactor Attribute classes - Cleanup, Security, and Readability and minor performance.

Issue #2096855 by zero2one: Fixed FilterHtmlImageSecure does not support images with spaces in the filename.