updated version to 2.5
Allow giving a callback as an allowedValue to OptionsResolver
feature #8375 [OptionsResolver] Allow giving a callback as an allowedValue to OptionsResolver (marekkalnik)

This PR was merged into the 2.5-dev branch.

Discussion
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[OptionsResolver] Allow giving a callback as an allowedValue to OptionsResolver

I recently had to use an option which was an array and could contain some one or multiple values from a list. As it could contain all possible combinations, it was not possible to validate it with a list of allowed values.

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | --
| License       | MIT
| Doc PR        | https://github.com/symfony/symfony-docs/pull/3437

Commits
-------

07d1d30 Allow giving a callback as an allowedValue to OptionsResolver
Merge branch '2.4'

* 2.4:
  udpated LICENSE year
  update year on licenses
  rundown and typo fix
  [Process] Fix #9861 : Revert TTY mode
  [Form] Update minimal requirement in composer.json
  Fix Empty translations with Qt files
  [Console] Fixed command name guessing if an alternative is an alias.
  Update UPGRADE-2.3.md to account for #9388
  [WebProfilerBundle] Fixed profiler toolbar icons for XHTML.
  [BrowserKit] Throw exception on invalid cookie expiration timestamp
  [Propel1Bridge][ModelChoiceList] add exception message for invalid classes
Merge branch '2.4'

* 2.4: (52 commits)
  Fix #8205 : Deprecate file mode update when calling dumpFile
  Fix #10437: Catch exceptions when reloading a no-cache request
  Fix libxml_use_internal_errors and libxml_disable_entity_loader usage
  removed ini check to make uploadedfile work on gae
  Update OptionsResolver.php
  fixed comment in forms.xml file
  Clean KernelInterface docblocks
  Cast the group name as a string
  Fixed doc of InitAclCommand
  [Form] Fix "Array was modified outside object" in ResizeFormListener.
  Fix IBAN validator
  [Process] Remove unreachable code + avoid skipping tests in sigchild environment
  Fixed bug that incorrectly causes the "required" attribute to be omitted from select even though it contains the "multiple" attribute
  Added travis_retry to .travis.yml
  [Process] fix some typos and refactor some code
  [Process] Fix unit tests in sigchild disabled environment
  [Process] Trow exceptions in case a Process method is supposed to be called after termination
  fixed typo
  [Process] fixed fatal errors in getOutput and getErrorOutput when process was not started
  [Process] Fix escaping on Windows
  ...

Conflicts:
	src/Symfony/Bundle/FrameworkBundle/Command/ServerRunCommand.php
	src/Symfony/Component/Form/Extension/Core/EventListener/ResizeFormListener.php
	src/Symfony/Component/Process/Process.php
	src/Symfony/Component/Process/ProcessPipes.php
	src/Symfony/Component/Process/Tests/AbstractProcessTest.php