[Doc] add link to Varnish website
Register Commands in the Service Container
[Form] Add a 'submitted' attribute to the form view
Documents Output::*Verbose methods
Merge branch 'patch-2' of github.com:nicolas-bastien/symfony-docs into nicolas-bastien-patch-2

Conflicts:
	cookbook/cache/varnish.rst
Merge pull request #3029 from egeloen/f-valid-form-view

[Form] Add a 'submitted' attribute to the form view
Merge pull request #3031 from lyrixx/command-in-the-DIC

[WCM]Register Commands in the Service Container
[#3031] Adding some details as to why you may or may not want to register a command a service
put back the command argument when executing a command in the CommandTester
added CVE-2013-5958
Merge branch '2.0' into 2.1
Merge branch '2.1' into 2.2
Merge branch '2.2' into 2.3
Merge branch '2.3'
Merge pull request #3048 from lyrixx/console-ouput-verbosity

Documents Output::*Verbose methods
[#3048] Adding intro paragraph about the semantic verbosity methods
[#3031] Fixing typo thanks to @xabbuh