[Cookbook][Security] x509 doc for pre authenticated listeners
Added pre_authenticated to map.rst
Corrected pre_authenticated cookbook entry
fixing last issues in pre_authenticated cookbook entry
full xml config, pushed the note at the end of the entry
Added May changelog
Added May changelog
Added May changelog
change version numbers in installation notes to be in line with the documented Symfony version
minor #3882 change version numbers in installation notes to be in line with the docu... (xabbuh)

This PR was submitted for the master branch but it was merged into the 2.5 branch instead (closes #3882).

Discussion
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change version numbers in installation notes to be in line with the docu...

...mented Symfony version

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | 2.5
| Fixed tickets |

This PR updates the version constraints in the installation instructions as described [here](http://symfony.com/doc/current/contributing/documentation/overview.html#when-a-new-branch-is-created-for-a-release):

> Change all version and master references to the correct version (e.g. 2.3). For example, in installation chapters, we reference the version you should use for installation. As an example, see the changes made in PR #2688.

Commits
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f77392a change version numbers in installation notes to be in line with the documented Symfony version
Merge remote-tracking branch 'origin/2.5' into 2.5
feature #3913 [Cookbook][Security] Added doc for x509 pre authenticated listener (zefrog)

This PR was merged into the 2.3 branch.

Discussion
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[Cookbook][Security] Added doc for x509 pre authenticated listener

| Q             | A
| ------------- | ---
| Doc fix?      | no
| New docs?     | yes
| Applies to    | 2.3+
| Fixed tickets | -

This can be merged in 2.3. Regards.

Commits
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57cc957 full xml config, pushed the note at the end of the entry
01d18fe fixing last issues in pre_authenticated cookbook entry
83c40e9 Corrected pre_authenticated cookbook entry
f5a6d58 Added pre_authenticated to map.rst
6c9a204 [Cookbook][Security] x509 doc for pre authenticated listeners
Merge remote-tracking branch 'origin/2.3' into 2.3
Merge branch '2.3' into 2.4

Conflicts:
	changelog.rst
Merge branch '2.4' into 2.5

Conflicts:
	changelog.rst
Merge branch '2.5'