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.
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 submit.rst

Actually Rendered as ``button`` ``submit`` tag (not ``input`` ``submit``)
removed one space

removed one space
minor #4038 Update rendered tag (kirill-oficerov)

This PR was submitted for the 2.5 branch but it was merged into the 2.3 branch instead (closes #4038).

Discussion
----------

Update rendered tag

Actually Rendered as ``button`` ``submit`` tag (not ``input`` ``submit``)

Commits
-------

1d50ce5 removed one space
067a447 Update submit.rst
minor #4030 enclose YAML strings containing % with quotes (xabbuh)

This PR was merged into the 2.3 branch.

Discussion
----------

enclose YAML strings containing % with quotes

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | all
| Fixed tickets | #1886, #4029

Thanks @iamdto, did you spot some other occurences in the docs?

Commits
-------

c1c4bc8 remove "..." from XML element tags
dbc02a2 quote YAML strings starting with % or @ characters
minor #4041 [Cookbook][Deployment] link to the deployment index (xabbuh)

This PR was merged into the 2.3 branch.

Discussion
----------

[Cookbook][Deployment] link to the deployment index

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | all
| Fixed tickets |

Commits
-------

7b5f038 link to the deployment index
minor #4044 Added editorconfig (WouterJ)

This PR was merged into the 2.3 branch.

Discussion
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Added editorconfig

| Q   | A
| --- | ---
| Doc fix? | no
| New docs? | no
| Applies to | all
| Fixed tickets | -

[EditorConfig](http://editorconfig.org/) is a very great project to maintain a
coding styles. It uses editor plugins for a dozen editors. This way, a file is
automatically fixed when the file is opened/written.

I think it'll be pretty usefull to use in the docs.

(fyi, symfony code has this for a long time already)

Commits
-------

af8a4ce Also apply it for .rst.inc files
7b78dc4 Added editorconfig
minor #4046 Fixed a minor syntax error (javiereguiluz)

This PR was merged into the 2.3 branch.

Discussion
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Fixed a minor syntax error

The nested list is wrongly displayed as a blockquote:

![syntax_error](https://cloud.githubusercontent.com/assets/73419/3673941/088aa490-1272-11e4-9c0c-377100e3a2ff.png)

Commits
-------

b3c6b87 Fixed a minor syntax error
minor #4042 [Cookbook] apply headline guidelines to the cookbook articles (xabbuh)

This PR was merged into the 2.3 branch.

Discussion
----------

[Cookbook] apply headline guidelines to the cookbook articles

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | all
| Fixed tickets |

This completes the work started in #3765, #3828 and #3829.

Commits
-------

1fa40f3 apply headline guidelines to the cookbook articles
Use getters on WebserviceUser
Security] [Custom Provider] Use properties on WebserviceUser
minor #4052 [Security] [Custom Provider] Use properties on WebserviceUser (entering)

This PR was submitted for the 2.5 branch but it was merged into the 2.3 branch instead (closes #4052).

Discussion
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[Security] [Custom Provider] Use properties on WebserviceUser

Commits
-------

c6ede6d Security] [Custom Provider] Use properties on WebserviceUser
8d69fc8 [Security] [Custom Provider] Use getters on WebserviceUser
$this->request replaced by $request

Using $this->request it does not work
one the $request is being injected
bug #4048 $this->request replaced by $request (danielsan)

This PR was submitted for the 2.5 branch but it was merged into the 2.3 branch instead (closes #4048).

Discussion
----------

$this->request replaced by $request

Using $this->request it does not work
one the $request is being injected

Commits
-------

b9b4e09 $this->request replaced by $request