updated CHANGELOG for 2.3.22
update CONTRIBUTORS for 2.3.22
updated VERSION for 2.3.22
fixed typo
bumped Symfony version to 2.3.23
[FrameworkBundle] cache:clear command fills *.php.meta files with wrong data
bug #12137 [FrameworkBundle] cache:clear command fills *.php.meta files with wrong data (Strate)

This PR was submitted for the 2.5 branch but it was merged into the 2.3 branch instead (closes #12137).

Discussion
----------

[FrameworkBundle] cache:clear command fills *.php.meta files with wrong data

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #12110
| License       | MIT

Test and fix of ticket #12110

Commits
-------

76273bf [FrameworkBundle] cache:clear command fills *.php.meta files with wrong data
Make `\Request::get` more performant.
Fix typo
reformat code as suggested by @fabpot
minor #12537 [HttpFoundation] Make Request::get() more performant (KorvinSzanto, xabbuh)

This PR was submitted for the 2.7 branch but it was merged into the 2.3 branch instead (closes #12537).

Discussion
----------

[HttpFoundation] Make Request::get() more performant

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

This finishes the work started by @KorvinSzanto in #12369.

Commits
-------

3039935 reformat code as suggested by @fabpot
ad64223 Fix typo
4162713 Make `\Request::get` more performant.
Merge branch '2.3' into 2.5

* 2.3:
  reformat code as suggested by @fabpot
  Fix typo
  Make `\Request::get` more performant.
  [FrameworkBundle] cache:clear command fills *.php.meta files with wrong data
  bumped Symfony version to 2.3.23
  fixed typo
  updated VERSION for 2.3.22
  update CONTRIBUTORS for 2.3.22
  updated CHANGELOG for 2.3.22

Conflicts:
	src/Symfony/Component/HttpKernel/Kernel.php