Issue #1934568 by David_Rothstein, StryKaizer, borisson_, martin107, pwolanin, ofry, amitgoyal: Allow sites using the 'image_allow_insecure_derivatives' variable to have partial protection from the Drupal 7.20 security issue

Issue #1392754 by tss, justAChris, jhodgdon: Comply with new documentation standards for @file for namespaced class files

Issue #2368987 by Wim Leers, Berdir, Schnitzel, epari.siva, bircher, vijaycs85, likin: Move internal page caching to a module to avoid relying on config get on runtime

Issue #2395395 by alexpott, effulgentsia, Gábor Hojtsy: TestBase lacks a config method to be used consistently in tests

Issue #697760 by sun: Replace getInfo() in tests with native phpDoc + annotations (following PHPUnit).

Issue #2218463 by znerol, damiankloip, rbayliss: Fixed Private file and image style downloads throw 500 error when page cache is active.

Issue #1955378 by skek, Darren Oh, David_Rothstein, claudiu.cristea: Fixed Return same derivative token with path or URI.

Issue #1888424 by katbailey, steveoliver, twistor, beejeebus, effulgentsia: Change notice: Make Drupal's URL generation logic available to HttpKernel, and minimize code repetition/divergence.

Issue #1934498 by attiks, Jelle_S, David_Rothstein: Allow the image style 'itok' token to be suppressed in image derivative URLs.

Issue follow-up #927138 by manarth, handrus, David_Rothstein: Fail image generation with 404 instead of 500, when source file is missing.

Issue #1561362 by Niklas Fiekas, chrisdolby, mtift: Change file_transfer() to use BinaryFileResponse.

Issue #1922814 by Berdir, Damien Tournoud, pwolanin, David_Rothstein, Heine, Bèr Kessels: Fixed Denial-of-service vulnerabiility in Image module.

Issue #1496480 by mrf, disasm, kbasarab, pfrenssen, cam8001, typhonius, Letharion, ACF, vijaycs85, heyrocker, Berdir, alexpott: Convert file system settings to the new configuration system.

Issue #1782244 by heyrocker, andypost, tstoeckler: Convert image styles  array into ImageStyle (extends ConfigEntity).

Issue #606598 by andypost, stBorchert, sun, aspilicious, joachim: Added Human readable image-style names.

Issue #1507988 by Berdir, chx, netiva jak, frega, greggles, Xenza, and Damien Tournoud: Fixed SA-CORE-2012-002 - Access bypass - private images.

Issue #1711070 by kid_icarus, tim.plunkett, xjm, droplet, zendoodles and cam8001: Convert tests to use ::$modules property instead of parent::setUp($modules).