* 2.1:
[Console] Fix style escaping parsing
[Console] Make style formatter matching less greedy to avoid having to escape when not needed
[Bundle] [FrameworkBundle] fixed indentation in esi.xml services file.
[Component] [Security] fixed PSR-2 coding violation in ClassUtilsTest class.
[Form] Fixed EntityChoiceList when loading objects with negative integer IDs
[TwigBundle] There is no CSS visibility of display, should be visible instead
[Form] corrected source node for a Danish translation
[DependencyInjection] fixed a bug where the strict flag on references were lost (closes#6607)
[HttpFoundation] Check if required shell functions for `FileBinaryMimeTypeGuesser` are not disabled
[CssSelector] added css selector with empty string
[HttpFoundation] Docblock for Request::isXmlHttpRequest() now points to Wikipedia
[DependencyInjection] refactored code to avoid logic duplication
[Form] Deleted references in FormBuilder::getFormConfig() to improve performance
[HttpFoundation] Update docblock for non-working method
Conflicts:
src/Symfony/Bundle/TwigBundle/Resources/views/Exception/trace.html.twig
src/Symfony/Bundle/TwigBundle/Resources/views/Exception/traces.html.twig
FormBuilder initially sets unresolved children as NULL, until resolved.
If FormBuilder::remove() is called before that child is resolved, the
if statement turns false, because isset(null) is false, when it should
be true. Instead, we should check to see if the key exists, and if so,
process and unset it.
Closes#4803
In order to perform some introspection on a FormBuilder instance,
we need to be able to get its children. Almost everything is accessible
in this class, but the children are not.
This PR adds a all() method to respect the current API (get(), remove(),
...).
