[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.
[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.
updated CHANGELOG for 2.1.11
update CONTRIBUTORS for 2.1.11
updated VERSION for 2.1.11
Merge branch '2.1' into 2.2

* 2.1:
  updated VERSION for 2.1.11
  update CONTRIBUTORS for 2.1.11
  updated CHANGELOG for 2.1.11

Conflicts:
	src/Symfony/Component/HttpKernel/Kernel.php
removed CHANGELOG for 2.1
updated CHANGELOG for 2.2.2
updated VERSION for 2.2.2
bumped Symfony version to 2.2.3-DEV
Merge branch '2.2' into 2.3

* 2.2:
  bumped Symfony version to 2.2.3-DEV
  updated VERSION for 2.2.2
  updated CHANGELOG for 2.2.2
  removed CHANGELOG for 2.1
  updated VERSION for 2.1.11
  update CONTRIBUTORS for 2.1.11
  updated CHANGELOG for 2.1.11

Conflicts:
	src/Symfony/Component/HttpKernel/Kernel.php
[Security] Removed an unnecessary call to sprintf() and added a test case.
[Security] Added a test to the BasicAuthenticationListener.
[Security] Added tests for the ContextListener.
[Security] Added tests for the SwitchUserListener.
[Security] Added few new test cases for the HttpUtils and improved readability of existing tests.
[Config] Added tests for the ConfigCache.
[Config] Fixed @covers annotation which ignored some of the methods from the code coverage.
[Config] Added tests for the FileResource and DirectoryResource.