[Security] Add SimpleForm authentication
[Security] Add simple_token auth method
[Security] Renamed simple_token to simple_http, added support for failure and success handler to both simple firewalls
fixed wrong Logger interface
moved the simple HTTP authenticator to a pre-auth one
[Security] allowed simple pre-auth to be optional if another auth mechanism already authenticated the user
marked some classes as being experimental in 2.3
[HttpFoundation][NamespacedAttributeBag] Refactoring of resolveKey() method
removed CHANGELOG for 2.0 as it is not maintained anymore
[DomCrawler] Fixed the Crawler::html() method for PHP versions earlier than 5.3.6.

Node argument was added to the DOMDocument::saveHTML() in PHP 5.3.6. See http://php.net/manual/en/domdocument.savehtml.php.
[Validator] added missing Estonian translations

Estonian translations for the following validators:

-  Currency;
-  EqualTo;
-  IdenticalTo;
-  NotEqualTo;
-  NotIdenticalTo;
-  GreaterThan;
-  GreaterThanOrEqual;
-  LessThan;
-  LessThanOrEqual;
merged branch kgilden/trans-et (PR #8016)

This PR was merged into the master branch.

Discussion
----------

[Validator] added missing Estonian translations

| Q             | A
| ------------- | ---
| Fixed tickets | -
| License       | MIT

Commits
-------

fd2b260 [Validator] added missing Estonian translations
merged branch jakzal/bugfix/domcrawler-savehtml (PR #8013)

This PR was merged into the master branch.

Discussion
----------

[DomCrawler] Fixed the Crawler::html() method for early PHP versions

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes, but not on travis (segfault)
| Fixed tickets | #7963
| License       | MIT
| Doc PR        | -

Node argument was added to the [`DOMDocument::saveHTML()`](http://php.net/manual/en/domdocument.savehtml.php) in PHP 5.3.6. See http://php.net/manual/en/domdocument.savehtml.php.

It's not a nice looking solution, but seems to be the only option. Condition should be removed once PHP dependency goes over 5.3.6.

Commits
-------

a4e3ebf [DomCrawler] Fixed the Crawler::html() method for PHP versions earlier than 5.3.6.
changed all version deps to accepts all upcoming Symfony versions
[Console] Added status code to CommandTester and ApplicationTester

Theses classes are already statefull. They contain the input and the
output data. So we can safely add the last status code to the class.
removed versions in composer.json files
[ADD] Component_Console -add suggest in the composer.json to event-dispatcher
merged branch fabpot/dep-versions (PR #8017)

This PR was merged into the master branch.

Discussion
----------

changed all version deps to accept all upcoming Symfony versions

Everything is in the title.

Commits
-------

b1c9fd2 removed versions in composer.json files
f41ac06 changed all version deps to accepts all upcoming Symfony versions
[Console] Removed the descriptor from data set providers.
[Console] fix test for NullOutput that does not print anything and add a failing test for verbosity