Issue #1998698 by larowlan, jibran, quicksketch: Allow Dialog Controller to work with form/entity form routes.

Issue #1987066 by Kevin Morse, JohnAlbin, rteijeiro, echoz, ry5n: Rename files to match CSS file naming convention.

Issue #1944472 by larowlan, quicksketch, effulgentsia: Add generic content handler for returning dialogs.

Issue #1870764 by quicksketch, dawehner, frega, larowlan, nod_: Add an ajax command which makes it easy to use the dialog API in complex cases.

Issue #1848880 by Wim Leers, effulgentsia: Test order of AJAX commands: add Ajax\FrameworkTest::testOrder(), strengthen testLazyLoad(), fix JS settings not being prepended.

Issue #1667742 by larowlan, nod_, effulgentsia, jessebeach, sun: Change notice: Add abstracted dialog to core (resolves accessibility bug).

Issue #1431658 by Albert Volkman, xjm, kid_icarus, ChinggizKhan, rgristroph, connork: Massive API docs cleanup for system tests

- Patch #1677304 by socketwench, Niklas Fiekas: Remove drupal_deliver_page(), ajax_deliver(), drupal_deliver_html_page().