[Console] fixed handling of "0" input on ask
[Console] Fix merging of application definition, fixes #7068, replaces #7158
Fix default value handling for multi-value options

The default value for array options will be an array, so it is not suitable to use as the default when processing one of many values for a multi-value option. Using null seems appropriate here, as it indicates the absence of a value and also converts nicely to an empty string (as opposed to an empty array).

Fixes #7689
Merge branch '2.1' into 2.2

* 2.1:
  Fix default value handling for multi-value options
  [HttpKernel] truncate profiler token to 6 chars (see #7665)
  Disabled APC on Travis for PHP 5.5+ as it is not available
  [HttpFoundation] do not use server variable PATH_INFO because it is already decoded and thus symfony is fragile to double encoding of the path
  [Yaml] improved boolean naming ($notEOF -> !$EOF)
  [Yaml] fixed handling an empty value
  [Routing][XML Loader] Add a possibility to set a default value to null
  The /e modifier for preg_replace() is deprecated in PHP 5.5; replace with preg_replace_callback()
  [HttpFoundation] Fixed bug in key searching for NamespacedAttributeBag
  [Form] DateTimeToRfc3339Transformer use proper transformation exteption in reverse transformation
  Update PhpEngine.php
  [HttpFoundation] getClientIp is fixed.

Conflicts:
	.travis.yml
	src/Symfony/Component/Routing/Loader/XmlFileLoader.php
	src/Symfony/Component/Routing/Loader/schema/routing/routing-1.0.xsd
	src/Symfony/Component/Routing/Tests/Fixtures/validpattern.xml
	src/Symfony/Component/Routing/Tests/Loader/XmlFileLoaderTest.php
Merge branch '2.2'

* 2.2:
  Fix default value handling for multi-value options
  [HttpKernel] truncate profiler token to 6 chars (see #7665)
  Disabled APC on Travis for PHP 5.5+ as it is not available
  [HttpFoundation] do not use server variable PATH_INFO because it is already decoded and thus symfony is fragile to double encoding of the path
  Fix download over SSL using IE < 8 and binary file response
  [Console] Fix merging of application definition, fixes #7068, replaces #7158
  [HttpKernel] fixed the Kernel when the ClassLoader component is not available (closes #7406)
  fixed output of bag values
  [Yaml] improved boolean naming ($notEOF -> !$EOF)
  [Yaml] fixed handling an empty value
  [Routing][XML Loader] Add a possibility to set a default value to null
  [Console] fixed handling of "0" input on ask
  The /e modifier for preg_replace() is deprecated in PHP 5.5; replace with preg_replace_callback()
  fixed handling of "0" input on ask
  [HttpFoundation] Fixed bug in key searching for NamespacedAttributeBag
  [Form] DateTimeToRfc3339Transformer use proper transformation exteption in reverse transformation
  Update PhpEngine.php
  [PropertyAccess] Add objectives to pluralMap
  [Security] Removed unused var
  [HttpFoundation] getClientIp is fixed.

Conflicts:
	src/Symfony/Component/Console/Tests/Command/CommandTest.php
	src/Symfony/Component/Console/Tests/Input/ArgvInputTest.php
	src/Symfony/Component/HttpFoundation/Request.php
	src/Symfony/Component/HttpKernel/Kernel.php
fixed previous merge