[DomCrawler] added support for HTML5 'form' attribute
[Debug] added the component (closes #6828, closes #6834, closes #7330)
added a main Debug class to ease integration
[Debug] made the exception handler independant of HttpFoundation
[Debug] ensured that the Debug tools can only be registered once
[Debug] changed composer to accept more versions
[Debug] fixed minor bugs
fixed typos
merged branch fabpot/debug-component (PR #7441)

This PR was merged into the master branch.

Discussion
----------

[Debug] added the component (closes #6828, closes #6834, closes #7330)

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | yes
| Tests pass?   | yes
| Fixed tickets | #6828, #6834, #7330
| License       | MIT
| Doc PR        | symfony/symfony-docs#2479

You can use the individual tools, or register them all:

```php
use Symfony\Component\Debug\Debug;

Debug::enable();
```

Changes in Symfony SE: symfony/symfony-standard#523

Commits
-------

f693128 fixed typos
1ab1146 [Debug] fixed minor bugs
daa3a3c [Debug] changed composer to accept more versions
e455269 [Debug] ensured that the Debug tools can only be registered once
946bfb2 [Debug] made the exception handler independant of HttpFoundation
2b305c2 added a main Debug class to ease integration
2ff0927 [Debug] added the component (closes #6828, closes #6834, closes #7330)
dump the list of available bundles (and extension alaises) if no name is provided
merged branch lsmith77/config_dump_ref_list_bundles (PR #7578)

This PR was submitted for the 2.1 branch but it was merged into the master branch instead (closes #7578).

Discussion
----------

dump the list of available bundles (and extension alaises) if no name is provided

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets |
| License       | MIT
| Doc PR        |

Not sure if this should only go into master or if such a small tweak can also go into 2.1 or at least 2.2

Commits
-------

2ba6fca dump the list of available bundles (and extension alaises) if no name is provided
AF_* constants are only available with the sockets extension
merged branch webfactory/fix-af-inet-define (PR #7535)

This PR was squashed before being merged into the master branch (closes #7535).

Discussion
----------

AF_* constants are only available with the sockets extension

Skip test if the extension is not available

Commits
-------

82e550b AF_* constants are only available with the sockets extension
merged branch kepten/ticket_7486 (PR #7500)

This PR was merged into the master branch.

Discussion
----------

[DomCrawler] added support for HTML5 'form' attribute

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #7486
| License       | MIT
| Doc PR        |

Commits
-------

f8178dd [DomCrawler] added support for HTML5 'form' attribute