Issue #2454649 by Aki Tendo, dawehner: Cache Optimization and hardening -- [PP-1] Use assert() instead of exceptions in Cache::merge(Tags|Contexts)

Issue #2529514 by dawehner, Fabianx, Wim Leers: Replace system.filter::protocols with container parameters

Issue #2351015 by plach, effulgentsia, Wim Leers, dawehner, martin107, damiankloip, cilefen, Fabianx, catch, pwolanin, Damien Tournoud, znerol, YesCT, larowlan: URL generation does not bubble cache contexts

Issue #2509300 by dawehner, catch, larowlan: Path alias UI allows node/1 and /node/1 as system path then fatals

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

Issue #2483781 by borisson_, rbayliss, cilefen, mitalimehta, joshi.rohit100: Move cache contexts classes from \Drupal\Core\Cache to \Drupal\Core\Cache\Context

Issue #2335661 by Wim Leers, pwolanin, dawehner, Fabianx, larowlan, catch, Berdir: Outbound path & route processors must specify cacheability metadata

Issue #2074297 by pwolanin, hussainweb, larowlan: Optimize the code in doGenerate() in the UrlGenerator to take advantage of Drupal path restrictions.

Issue #2345725 by tim.plunkett: Query parameters are not decoded the same as the path portion of a URL

Issue #2328111 by dawehner, martin107, neclimdul: Replace most instances of the DRUPAL_ROOT constant with the app.root container parameter.

Issue #2345753 by tim.plunkett, dawehner, Wim Leers, damiankloip: Remove url(current_path()) and url(NULL) with <current> and <none>.

Issue #2340251 by iMiksu, alexpott, tim.plunkett, dawehner, Wim Leers: Remove most remaining url() calls.

Issue #2316537 by dawehner | chx: Upgrade symfony CMF to 1.2, remove deprecated parameters from getRouteByName* .

Issue #2284103 by alexpott, fabpot, damiankloip, Xano, Xen, Berdir: Fixed Remove the request from the container.

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

Issue #1798296 by damiankloip, Xano, David_Rothstein, Crell, dawehner: Integrate CSRF link token directly into routing system.

Issue #2057155 by pwolanin, dawehner: Add a generateFromRoute() method on the url generator to accept options like url().

Stupid commit message. :P Fixing. :P

This reverts commit 838bf21e.

Issue #2031353 by pwolanin, dawehner, katbailey: Fixed URLgenerator broken for Drupal installed in a subdirectory - doesn't have a way to get a Drupal path.

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