Update components/http_foundation/sessions.rst

added missing backslash
Merge remote-tracking branch 'upstream21/2.1' into 2.1
Create formatterhelper.rst
Update components/http_foundation/session_configuration.rst

https://github.com/symfony/symfony-docs/commit/ce350250f42242680a796fb0322a7acd36f08e42
Update components/console/introduction.rst

https://github.com/symfony/symfony-docs/commit/bf9495279cf05523d3c7b23a3077d06ef56f85bc
Merge pull request #202 from StefTweet/2.1

Updated at 13/11/2012