Added verbosity methods
minor #11274 Added verbosity methods to NullOutput (WouterJ)

This PR was merged into the 2.4 branch.

Discussion
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Added verbosity methods to NullOutput

These 4 methods were not added to the OutputInterface because of BC, but they should still be implemented in all classes which implement that interface. Otherwise we have to do nasty tricks...

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

Commits
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0459249 Added verbosity methods
Merge branch '2.4' into 2.5

* 2.4:
  Remove Spaceless Blocks From Twig Templates
  Validate locales sets intos translator
  Fix UserPassword validator translation
  Remove Spaceless Blocks from Twig Form Templates
  fixed typo
  [HttpFoundation] Fix to prevent magic bytes injection in JSONP responses (Prevents CVE-2014-4671)
  added regression test
  fix issue #8171 on configuration tree for twig extension -- pairing up with @cordoval
  [HttpFoundation] Fix wrong assertion in Response test
  [Upgrade] Fixed markdown syntax
  [2.3][Form] Cleanup & fix phpdocs
  Added verbosity methods

Conflicts:
	src/Symfony/Component/Form/FormError.php