[Console] improve deprecation warning triggers

Since the default helper set of the Console `Application` relies on
the `DialogHelper`, the `ProgressHelper` and the `TableHelper`, there
must be a way to not always trigger `E_USER_DEPRECATION` errors when
one of these helper is used.
fixed a test
updated CHANGELOG for 2.3.23
update CONTRIBUTORS for 2.3.23
updated VERSION for 2.3.23
bumped Symfony version to 2.3.24
updated CHANGELOG for 2.5.8
update CONTRIBUTORS for 2.5.8
updated VERSION for 2.5.8
bumped Symfony version to 2.5.9
updated CHANGELOG for 2.6.1
updated VERSION for 2.6.1
bumped Symfony version to 2.6.2
CS fixes
Removed unused imports
minor #12837 [2.3] CS Fixes And Removed Unused Imports (GrahamCampbell)

This PR was merged into the 2.3 branch.

Discussion
----------

[2.3] CS Fixes And Removed Unused Imports

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

##### This pull request fixes some cs issues in symfony 2.3.

As far as I understand, symfony's coding standards dictate that there should be no blank lines between imports and imports should not be prefixed with a slash. There are one or two other tiny fixes in here too.

Also, we should only import things that we actually *use*. :)

Commits
-------

0e4f0e7 Removed unused imports
0fc3369 CS fixes
[2.3] More cs fixes
minor #12840 [2.3] More cs fixes (GrahamCampbell)

This PR was squashed before being merged into the 2.3 branch (closes #12840).

Discussion
----------

[2.3] More cs fixes

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

##### This pull request fixes some more cs issues in symfony 2.3.

I should be done with cs fixes to the 2.3 branch now. Sorry I missed these in my last pull.

Commits
-------

b034b08 [2.3] More cs fixes
Merge branch '2.3' into 2.5

* 2.3:
  [2.3] More cs fixes
  Removed unused imports
  CS fixes
  bumped Symfony version to 2.3.24
  updated VERSION for 2.3.23
  update CONTRIBUTORS for 2.3.23
  updated CHANGELOG for 2.3.23

Conflicts:
	src/Symfony/Bundle/FrameworkBundle/EventListener/SessionListener.php
	src/Symfony/Bundle/SecurityBundle/DependencyInjection/MainConfiguration.php
	src/Symfony/Component/HttpKernel/Kernel.php
	src/Symfony/Component/HttpKernel/Tests/Bundle/BundleTest.php
	src/Symfony/Component/Routing/Matcher/Dumper/PhpMatcherDumper.php
Revert "minor #12821 Remove deprecated class (MasterB)"

This reverts commit 3d637487f08368209274d61aaec278746101d440, reversing
changes made to 7a5762c1982e1675ab52a01d5b348343bfe3f4b0.