Updating Symfony version from 2.4 to 2.5

The descriptions are still displaying the old version
Configuring composer.json to use the 2.5 version

Configuring composer.json to use the 2.5 version Rather than 2.4
quote YAML strings starting with % or @ characters

Pygment uses the YAML 1.1 standard to parse YAML code being highlighted.
A string value cannot start with the percent sign or the @ character
in YAML 1.1 without being quoted. To highlight the YAML code blocks
properly, strings starting with the percent sign are now enclosed in
double quotes.
remove "..." from XML element tags

The ellipses were used as placeholders in XML element tags. Thus, the
XML wasn't well-formed and therefore would have never been rendered
properly.
Update version in Rework your Patch section
link to the deployment index
apply headline guidelines to the cookbook articles
Added editorconfig
Fixed a minor syntax error
Also apply it for .rst.inc files
Update twig_reference.rst

Fix typo
minor #4019 Update twig_reference.rst (redstar504)

This PR was submitted for the 2.5 branch but it was merged into the 2.3 branch instead (closes #4019).

Discussion
----------

Update twig_reference.rst

Fix typo

Commits
-------

bd40720 Update twig_reference.rst
minor #4026 Updating Symfony version from 2.4 to 2.5 (danielsan)

This PR was merged into the 2.5 branch.

Discussion
----------

Updating Symfony version from 2.4 to 2.5

The descriptions are still displaying the old version

Commits
-------

81d962f Configuring composer.json to use the 2.5 version
2299df0 Updating Symfony version from 2.4 to 2.5
minor #4035 Update version in Rework your Patch section (yguedidi)

This PR was merged into the 2.3 branch.

Discussion
----------

Update version in Rework your Patch section

Commits
-------

7b2f9b4 Update version in Rework your Patch section
Merge branch '2.3' into 2.4

* 2.3:
  Update twig_reference.rst
  Update version in Rework your Patch section
Merge branch '2.4' into 2.5

* 2.4:
  Update twig_reference.rst
  Update version in Rework your Patch section
Merge branch '2.5'

* 2.5:
  Update twig_reference.rst
  Update version in Rework your Patch section
  Configuring composer.json to use the 2.5 version
  Updating Symfony version from 2.4 to 2.5
Update internals.rst

The proper idiom is "behind the scenes".

I also fixed the sentence structure.
minor #4034 Update internals.rst (redstar504)

This PR was submitted for the 2.5 branch but it was merged into the 2.3 branch instead (closes #4034).

Discussion
----------

Update internals.rst

The proper idiom is "behind the scenes".

I also fixed the sentence structure.

Commits
-------

9966b90 Update internals.rst
Update page_creation.rst

Fix sentence structure.