Merge branch '2.4' into 2.5

* 2.4:
  Fixed failed config schema loads due to libxml_disable_entity_loader usage.
  enabled PHP 5.6 for tests
  [Process] Fix ExecutableFinder with open basedir
  Refactored the CssSelector to remove the circular object graph
  Fix mocks to support >=5.5.14 and >=5.4.30
  [ClassLoader] fixed PHP warning on PHP 5.3
  [Validator] added Lithuanian translation for empty file
  Added missing dutch translations
  [Components][Serializer] optional constructor arguments can be omitted during the denormalization process
  [DomCrawler] properly handle buttons with single and double quotes inside the name attribute
  Added missing pt and pt_BR translations
Merge branch '2.5'

* 2.5:
  Fixed failed config schema loads due to libxml_disable_entity_loader usage.
  enabled PHP 5.6 for tests
  [Process] Fix ExecutableFinder with open basedir
  Refactored the CssSelector to remove the circular object graph
  Fix mocks to support >=5.5.14 and >=5.4.30
  [ClassLoader] fixed PHP warning on PHP 5.3
  [Validator] added Lithuanian translation for empty file
  Added missing dutch translations
  [Components][Serializer] optional constructor arguments can be omitted during the denormalization process
  [DomCrawler] properly handle buttons with single and double quotes inside the name attribute
  Added missing pt and pt_BR translations

Conflicts:
	src/Symfony/Component/Validator/Resources/translations/validators.nl.xlf
[Translation:update][Xliff Dumper] added target-language.
Added verbosity methods
[Console] Make sure formatter is the same

The parent constructor will create a new formatter if the $formatter parameter is null
This fix avoids that the formatter becomes 2 different instances in $this and $this->stderr
bug #11272 [Console] Make sure formatter is the same. (akimsko)

This PR was submitted for the 2.5 branch but it was merged into the 2.3 branch instead (closes #11272).

Discussion
----------

[Console] Make sure formatter is the same.

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets |
| License       | MIT
| Doc PR        |
The parent constructor will create a new formatter if the $formatter parameter is null.

This fix avoids that the formatter becomes 2 different instances in $this and $this->stderr, if null was passed to the constructor.

Commits
-------

64328d9 [Console] Make sure formatter is the same
Added SK translations
minor #11271 [Validator] Added missing Slovak translations (pulzarraider)

This PR was submitted for the master branch but it was merged into the 2.5 branch instead (closes #11271).

Discussion
----------

[Validator] Added missing Slovak translations

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

Commits
-------

585a045 Added SK translations
Remove Expression Language services when the component is unavailable
Simplified the Travis test command

There is no reason to turn a failure into a different failure. And this
will avoid Travis to say that the "false" command failed.
[DomCrawler] Remove the query string and the anchor of the uri of a link
bug #11194 [DomCrawler] Remove the query string and the anchor of the uri of a link (benja-M-1)

This PR was squashed before being merged into the 2.3 branch (closes #11194).

Discussion
----------

[DomCrawler] Remove the query string and the anchor of the uri of a link

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

Commits
-------

fe5d2d1 [DomCrawler] Remove the query string and the anchor of the uri of a link
[DomCrawler] Fix docblocks and formatting.
minor #11288 [DomCrawler] Fix Link docblocks and formatting (jakzal)

This PR was merged into the 2.3 branch.

Discussion
----------

[DomCrawler] Fix Link docblocks and formatting

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

re #11194

Commits
-------

5cbe13e [DomCrawler] Fix docblocks and formatting.
updated italian translation for validation messages
minor #11246 [Validator] updated italian translations  (micheleorselli)

This PR was submitted for the master branch but it was merged into the 2.3 branch instead (closes #11246).

Discussion
----------

[Validator] updated italian translations

Commits
-------

b74afe0 updated italian translation for validation messages
[Translation] Added unescaping of ids in PoFileLoader
bug #11238 [Translation] Added unescaping of ids in PoFileLoader (JustBlackBird)

This PR was submitted for the 2.5 branch but it was merged into the 2.3 branch instead (closes #11238).

Discussion
----------

[Translation] Added unescaping of ids in PoFileLoader

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

Although it is not directly described in gettext docs, _msgid_ should be unescaped too. The other reason to unescape _msgid_ is symmetry between ```PoFileLoader``` and ```PoFileDumper```. The dumper escapes both _msgid_ and _msgstr_ values, but the loader unescapes only _msgstr_.

Commits
-------

816a4a9 [Translation] Added unescaping of ids in PoFileLoader
minor #11233 [Serializer] Added a test for decoding xml with whitespaces (florianv)

This PR was merged into the 2.6-dev branch.

Discussion
----------

[Serializer] Added a test for decoding xml with whitespaces

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

The PR https://github.com/symfony/symfony/commit/466a3d70b7972dbac20264c254351ca31ee5c476 introduced a BC break because white spaces were previously decoded as text nodes.

So this PR reverts it and adds a context option to configure it.

Commits
-------

f5bf45e [Serializer] Added a test for decoding xml with whitespaces
minor #11285 Simplified the Travis test command (stof)

This PR was merged into the 2.3 branch.

Discussion
----------

Simplified the Travis test command

There is no reason to turn a failure into a different failure. And this will avoid Travis to say that the "false" command failed.

Commits
-------

e8d01c9 Simplified the Travis test command