removed dead code and fixed CS
[Form] Removed the "disabled" attribute from the placeholder option in select fields due to problems with the BlackBerry 10 browser
Fix issue with \DateTimeZone::UTC / 'UTC' for PHP 5.4
[Form] fixed wrong call to setTimeZone() (closes #8644)
merged branch bschussek/issue8526 (PR #8622)

This PR was merged into the 2.2 branch.

Discussion
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[Form] Removed the "disabled" attribute from the placeholder option in select fields due to problems with the BlackBerry 10 browser

| Q             | A
| ------------- | ---
| Bug fix?      | yes (together with #8623)
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #7678 #8478 #8526
| License       | MIT
| Doc PR        | -

Commits
-------

97cbb19 [Form] Removed the "disabled" attribute from the placeholder option in select fields due to problems with the BlackBerry 10 browser
Merge branch '2.2' into 2.3

* 2.2:
  [HttpKernel] added a missing dep for dev
  [Form] fixed wrong call to setTimeZone() (closes #8644)
  Fix issue with \DateTimeZone::UTC / 'UTC' for PHP 5.4
  [Form] Removed the "disabled" attribute from the placeholder option in select fields due to problems with the BlackBerry 10 browser
  [routing] added ability for apache matcher to handle array values
  removed dead code and fixed CS
  [Validator] fixed StaticMethodLoader trying to invoke methods of abstract classes (closes #8589)

Conflicts:
	src/Symfony/Bundle/TwigBundle/TokenParser/RenderTokenParser.php
	src/Symfony/Component/Form/FormConfigBuilder.php
	src/Symfony/Component/HttpKernel/composer.json
	src/Symfony/Component/Validator/Tests/GraphWalkerTest.php