[Security][Acl] Issue #5787 : Added MutableAclProvider::deleteSecurityIdentity

Code style fix and documentation typo
Fix finder date constraints and tests
added getter to transformer chain
Update LocaleTest.php
minor #8423 Update LocaleTest.php (mikemeier)

This PR was squashed before being merged into the 2.5-dev branch (closes #8423).

Discussion
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Update LocaleTest.php

de_CH locales does not fallback to de
see https://github.com/symfony/symfony/issues/5314

Commits
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572126b Update LocaleTest.php
feature #8305 Added MutableAclProvider::deleteSecurityIdentity (lavoiesl)

This PR was merged into the 2.5-dev branch.

Discussion
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Added MutableAclProvider::deleteSecurityIdentity

This provides a very simple function to enable the deletion of a SecurityIdentity.

Developers can add a listener on the delete of a user and remove all the related ACLs.
Foreign keys already ensure that the ACEs are properly deleted.

Among the problems of not deleting the SecurityIdentity:

* Inconsistent database, referring to a non-existent user.
* If a user is deleted and another is created with the same name, it will inherit all the old user’s ACEs

Not addressed by this PR: Changing a user’s username breaks the related ACLs. See #5787

See also: https://groups.google.com/forum/#!topic/symfony2/mGTXlTWiMs8/discussion

Commits
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bdbbe58 [Security][Acl] Issue #5787 : Added MutableAclProvider::deleteSecurityIdentity
feature #9837 [Form] added getter to transformer chain (cordoval)

This PR was merged into the 2.5-dev branch.

Discussion
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[Form] added getter to transformer chain

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #9503
| License       | MIT
| Doc PR        | na

Commits
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3565d96 added getter to transformer chain
feature #9360 [Finder] Fix finder date constraints and tests (ruian)

This PR was merged into the 2.5-dev branch.

Discussion
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[Finder] Fix finder date constraints and tests

Description:
When you search some files with date constraints, all folders are given, even if they are not in the date scope.

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  |no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #9303
| License       | MIT

Commits
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4ccafa6 Fix finder date constraints and tests
[Translation] Added template for relative file paths