Merge branch '2.8'

* 2.8:
  fix missing links to https://symfony.com
  fix missing links to https://symfony.com
  [travis] Don't use the cache
  [DebugBundle] Remove inlined dumps on XHR

Conflicts:
	src/Symfony/Component/Security/Acl/README.md
	src/Symfony/Component/Security/Core/README.md
	src/Symfony/Component/Security/Csrf/README.md
	src/Symfony/Component/Security/Http/README.md

Author: nicolas-grekas

README.md

@@ -17,4 +17,4 @@ You can run the unit tests with the following command:
     $ composer install
     $ phpunit
 
-[1]: http://symfony.com/doc/current/components/options_resolver.html
+[1]: https://symfony.com/doc/current/components/options_resolver.html