Removed some leaking deprecation warning in the Form component

Fixes #7101
merged branch jfcixmedia/2.1 (PR #5838)

This PR was squashed before being merged into the master branch (closes #5838).

Commits
-------

201f3e6 [Form] Fixed cannot unset string offsets in CsrfValidationListener

Discussion
----------

[Form] Fixed cannot unset string offsets in CsrfValidationListener

Bug fix: yes
Feature addition: no
Backwards compatibility break: no
Symfony2 tests pass: yes
Fixes the following tickets: -
Todo: -
License of the code: MIT
Documentation PR: -

A php fatal error is happening when someone rewrite the entire form data for an object with a single input.
```
Fatal error: Cannot unset string offsets in vendor/symfony/symfony/src/Symfony/Component/Form/Extension/Csrf/EventListener/CsrfValidationListener.php on line 72
```

Example:

```html
<form action="/app_dev.php/post/create" method="post" >
    <div id="posttype">
        <div>
            <label for="posttype_name" class="required">Name</label>
            <input type="text" id="posttype_name" name="posttype[name]" required="required" maxlength="255" />
        </div>
        <div>
            <label for="posttype_text" class="required">Text</label>
            <textarea id="posttype_text" name="posttype[text]" required="required"></textarea>
        </div>
        <input type="hidden" id="posttype__token" name="posttype[_token]" value="83a1617c694fbdea43c2527f1a55c7419ce82a42" /></div>
        <p>
            <button type="submit">Create</button>
        </p>
</form>
```

If someone alters the html to add a simple input at the bottom of the form like this one:
```html
<input type="text" id="posttype" name="posttype" value="test123" />
```

The result will be a php fatal error.

---------------------------------------------------------------------------

by bschussek at 2012-10-26T09:49:05Z

Thank you for the pull request! Could you please reference the pull request in the test?

```php
// https://github.com/symfony/symfony/pull/5838
public function testStringFormData()
{
    ...
```

---------------------------------------------------------------------------

by jfcixmedia at 2012-10-26T10:21:29Z

@bschussek  Added, thanks.
Added greek translation
[Form] Added test for "label" option to accept the value "0"
[Form] Fixed TimeType not to render a "size" attribute in select tags
merged branch bschussek/issue6153 (PR #7155)

This PR was merged into the 2.1 branch.

Commits
-------

b7bd630 [Form] Fixed TimeType not to render a "size" attribute in select tags

Discussion
----------

[Form] Fixed TimeType not to render a "size" attribute in select tags

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #6153
| License       | MIT
| Doc PR        | -
Merge branch '2.1' into 2.2

* 2.1:
  Defined stable version point of Doctrine.
  [HttpFoundation] Remove Cache-Control when using https download via IE<9 (fixes #6750)
  Update composer.json
  [Form] Fixed TimeType not to render a "size" attribute in select tags
  [Form] Added test for "label" option to accept the value "0"
  Expanded fault-tolerance for unusual cookie dates
  Fix docblock type
  [Form] Fixed "label" option to accept the value "0"
  merged branch jfcixmedia/2.1 (PR #5838)
  [DomCrawler] lowered parsed protocol string (fixes #6986)

Conflicts:
	composer.json
	src/Symfony/Bridge/Twig/Resources/views/Form/form_div_layout.html.twig
	src/Symfony/Bundle/FrameworkBundle/Resources/views/Form/time_widget.html.php
	src/Symfony/Bundle/FrameworkBundle/composer.json
	src/Symfony/Component/Form/Tests/Extension/Csrf/EventListener/CsrfValidationListenerTest.php
	src/Symfony/Component/Routing/composer.json
	src/Symfony/Component/Security/composer.json
	src/Symfony/Component/Validator/composer.json
Merge branch '2.2'

* 2.2:
  Defined stable version point of Doctrine.
  [HttpFoundation] Remove Cache-Control when using https download via IE<9 (fixes #6750)
  Update composer.json
  [Form] Fixed TimeType not to render a "size" attribute in select tags
  [Form] Added test for "label" option to accept the value "0"
  Expanded fault-tolerance for unusual cookie dates
  Fix docblock type
  [Form] Fixed "label" option to accept the value "0"
  Added greek translation
  merged branch jfcixmedia/2.1 (PR #5838)
  added a note about a BC break for the path info of sub-request (closes #7138)
  [DomCrawler] lowered parsed protocol string (fixes #6986)
  [FrameworkBundle] Fix a BC for Hinclude global template
  [HttpKernel] fixed locale management when exiting sub-requests
  fixed HInclude renderer (closes #7113)
  Removed some leaking deprecation warning in the Form component
  [HttpKernel] hinclude fragment renderer must escape URIs properly to return valid html

Conflicts:
	src/Symfony/Bundle/FrameworkBundle/composer.json
	src/Symfony/Component/Security/composer.json