Removed duplicate NativeFileSessionHandler
Merge branch '2.1'

Conflicts:
	components/console/introduction.rst
Merge branch '2.0' into 2.1

Conflicts:
	book/controller.rst
	book/from_flat_php_to_symfony2.rst
	book/page_creation.rst
Merge branch '2.1'
[#1881] Fixing bad call to getting flash messages in PHP
[Book/installation] Fixed "image file not readable" warning
add JsonResponse exemple
Remove UniversalClassLoader from debugging recipe (composer autoload covers it)
Update cookbook/form/dynamic_form_generation.rst

fixed event type
Update cookbook/form/dynamic_form_generation.rst

added missing semicolon
Merge branch '2.0' into 2.1
Merge branch '2.1'
Update reference/constraints/Image.rst

Seems that annotations do not support trailing commas in parameter lists like PHP arrays do.
Merge branch '2.0' into 2.1

Conflicts:
	cookbook/form/create_custom_field_type.rst
	cookbook/form/data_transformers.rst
	cookbook/form/form_collections.rst
	cookbook/form/use_virtuals_forms.rst
	cookbook/symfony1.rst
	cookbook/validation/custom_constraint.rst
	cookbook/workflow/_vendor_deps.rst.inc
Merge branch '2.1'

Conflicts:
	components/console/introduction.rst
Merge branch 'patch-10' of github.com:WouterJ/symfony-docs into WouterJ-patch-10

Conflicts:
	book/security.rst
Add documentation about hidden response method in Console helper
Fix CS
Update components/http_foundation/sessions.rst

added missing backslash
Update components/http_foundation/sessions.rst

fixed typo