[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
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.