[HttpFoundation][NamespacedAttributeBag] Refactoring of resolveKey() method
[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.
Fix Crawler::children() to not trigger a notice for childless node
merged branch lazyhammer/issue-8048 (PR #8054)

This PR was merged into the 2.1 branch.

Discussion
----------

[DomCrawler] Fix Crawler::children() to not trigger a notice for childless node

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #8048
| License       | MIT
| Doc PR        | n/a

Commits
-------

91b8490 Fix Crawler::children() to not trigger a notice for childless node
[TwigBundle] Added missing files for phpunit
updated CHANGELOG for 2.3.0-RC1
updated VERSION for 2.3.0-RC1
bumped Symfony version to 2.3.0-DEV-DEV
[CssSelector] Fix :nth-last-child() translation
[CssSelector] Fix :nth-last-child() translation
[Console] Add clear() to ProgressHelper.

One may want to print something else while the progress bar is running.
The output will be messy if the progress bar is not removed first.

One may also want to remove the progress bar after the work is complete.
[Console] fix and refactor exit code handling
[Intl] Fixed the class namespaces in the @covers annotations.
[Config] Adding the previous exception message into the FileLoaderLoadException so it's more easily seen

In the framework if you, for example, make a syntax error in YAML, then the true, clear message (e.g. Unable to parse at line 5 (near "framework") is nested, and harder to visually see. This includes that message in the main exception so that users can debug more easily.

Before: Cannot import resource "/path/to/app/config/config.yml" from "/path/to/app/config/config_dev.yml".

After: Cannot import resource "/path/to/app/config/config.yml" from "/path/to/app/config/config_dev.yml". (Unable to parse at line 5 (near "framework").)
[CssSelector] Moved a test into the Tests folder.
merged branch jakzal/2.3-cssselector-test-location (PR #8090)

This PR was merged into the 2.3 branch.

Discussion
----------

[CssSelector] Moved a test into the Tests folder.

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

Commits
-------

b2e52e8 [CssSelector] Moved a test into the Tests folder.
merged branch jakzal/bugfix/intl-tests-covers (PR #8082)

This PR was merged into the 2.3 branch.

Discussion
----------

[Intl] Fixed the class namespaces in the @covers annotations.

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

Commits
-------

a39db7b [Intl] Fixed the class namespaces in the @covers annotations.
merged branch lazyhammer/issue-8068-2.1 (PR #8073)

This PR was merged into the 2.1 branch.

Discussion
----------

[CssSelector] Fix :nth-last-child() translation

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #8068
| License       | MIT
| Doc PR        | n/a

Same as #8072, but for < 2.3

Commits
-------

1469953 [CssSelector] Fix :nth-last-child() translation
merged branch lazyhammer/issue-8068 (PR #8072)

This PR was merged into the 2.3 branch.

Discussion
----------

[CssSelector] Fix :nth-last-child() translation

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #8068
| License       | MIT
| Doc PR        | n/a

Commits
-------

2d9027d [CssSelector] Fix :nth-last-child() translation
Merge branch '2.1' into 2.2

* 2.1:
  [CssSelector] Fix :nth-last-child() translation
  Fix Crawler::children() to not trigger a notice for childless node