fixed various inconsistencies
Merge branch '2.3' into 2.4

* 2.3:
  fixed various inconsistencies
  reduced recursion when building DumperPrefixCollection
  renamed variables - making next change more readable
  removing dead code.
  [DomCrawler] Fixed filterXPath() chaining
  [DomCrawler] Fixed incorrect handling of image inputs

Conflicts:
	src/Symfony/Component/DomCrawler/Crawler.php
	src/Symfony/Component/EventDispatcher/Tests/EventDispatcherTest.php
	src/Symfony/Component/Form/Extension/DependencyInjection/DependencyInjectionExtension.php
	src/Symfony/Component/Serializer/Tests/Normalizer/CustomNormalizerTest.php
	src/Symfony/Component/Templating/Tests/Loader/CacheLoaderTest.php
	src/Symfony/Component/Templating/Tests/Loader/LoaderTest.php
Merge branch '2.4'

* 2.4:
  fixed various inconsistencies
  reduced recursion when building DumperPrefixCollection
  renamed variables - making next change more readable
  removing dead code.
  [ExpressionLanguage] added some tests for the built-in constant() function
  [ExpressionLanguage] added some documentation about functions
  [DomCrawler] Fixed filterXPath() chaining
  [DomCrawler] Fixed incorrect handling of image inputs
[ClassLoader] A PSR-4 compatible class loader
feature #10100 [ClassLoader] A PSR-4 compatible class loader (derrabus)

This PR was squashed before being merged into the 2.5-dev branch (closes #10100).

Discussion
----------

[ClassLoader] A PSR-4 compatible class loader

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

This is a PSR-4 compatible class loader that I'd like to contribute to the ClassLoader component. Since PSR-4 is the most recent FIG standard for an autoloader, I thought a compatible loader should be part of a feature-complete ClassLoader component.

See: http://www.php-fig.org/psr/psr-4/

PSR-4 does neither replace PSR-0, nor are those standards 100% compatible. This is why I implemented the standard as a new class.

If you decide that my PR is worth merging, I would also provide a PR for symfony-docs with a documentation.

Commits
-------

6837df3 [ClassLoader] A PSR-4 compatible class loader
Fix class names in ApcUniversalClassLoader tests.
Merge branch '2.3' into 2.4

* 2.3:
  Revert PHPUnit version, revert APC configuration
  removed APC on the CLI for Travis as it does not work well with PHPUnit and Composer anyway
  [Security] Replace exception mocks with actual exception instances.
  Remove an unused argument.
  Use `Filesystem::chmod` instead of `chmod` when dumping file
  [Form] Added test for disabling buttons
  [Form] Added check for parent disabled status in Button form elements
  Fixes URL validator to accept single part urls
  tweaked Travis configuration to get more tests running
  fixed float comparison in unit tests for HHVM
  upgraded PHPUnit to version 4 for better HHVM support
  [Process] fixed HHVM usage on the CLI
  Fix class names in ApcUniversalClassLoader tests.
  fixed the profiler when an uncalled listener throws an exception when instantiated
  fixed CS
  Added test case for 4c6a2d15095c13b2a35751b2b2712b183be489c4
  Fixed bug in ChoiceType triggering a warning when not using utf-8
  fixed CS
  Avoid levenshtein comparison when using ContainerBuilder.

Conflicts:
	src/Symfony/Component/Form/Extension/Core/Type/ChoiceType.php
	src/Symfony/Component/HttpKernel/Debug/TraceableEventDispatcher.php
Merge remote-tracking branch 'symfony/master' into develop