[DomCrawler] fixed bug #12143
Clean up testing
Make fabbot happy
bug #13145 [DomCrawler] Fix behaviour with <base> tag (dkop, WouterJ)

This PR was merged into the 2.3 branch.

Discussion
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[DomCrawler] Fix behaviour with <base> tag

Finishes https://github.com/symfony/symfony/issues/12283

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #12283, #12143, #12144
| License       | MIT
| Doc PR        | -

Commits
-------

91447e8 Make fabbot happy
1d35e48 Clean up testing
61f22d7 [DomCrawler] fixed bug #12143
Merge branch '2.3' into 2.5

* 2.3:
  Updated generateSql tool
  Fix the implementation of deprecated Locale classes
  Fix phpdoc and coding standards
  Replace usages of the deprecated TypeTestCase by the new one
  Remove usages of deprecated constants
  Update functional tests to use the PSR NullLogger
  Make fabbot happy
  Clean up testing
  [DomCrawler] fixed bug #12143

Conflicts:
	src/Symfony/Bridge/Doctrine/Tests/Validator/Constraints/UniqueEntityValidatorTest.php
	src/Symfony/Bundle/FrameworkBundle/Tests/Templating/TimedPhpEngineTest.php
	src/Symfony/Bundle/TwigBundle/Tests/Loader/FilesystemLoaderTest.php
	src/Symfony/Component/Console/Application.php
	src/Symfony/Component/DomCrawler/Crawler.php
	src/Symfony/Component/Form/Tests/Extension/Core/Type/CollectionTypeTest.php
	src/Symfony/Component/Form/Tests/Extension/Csrf/Type/FormTypeCsrfExtensionTest.php
	src/Symfony/Component/HttpKernel/Tests/Bundle/BundleTest.php
	src/Symfony/Component/Serializer/Encoder/EncoderInterface.php
	src/Symfony/Component/Serializer/Encoder/XmlEncoder.php
	src/Symfony/Component/Validator/Tests/Mapping/ClassMetadataFactoryTest.php