Merge pull request #260 from StefTweet/2.3

Up to date the references Section
Merge pull request #257 from tyx/cookbook/assetic

[Cookbook] update assetic part
Update Section Config in components

correct some errors in Sphinx log
Add a new file
Merge pull request #261 from StefTweet/2.3

Update Section Config in components
Merge remote-tracking branch 'origine/master'
[Cookbook][Assetic] review jpeg_optimize
[Cookbook][Assetic] review yuicompressor
Merge pull request #264 from tyx/cookbook/assetic

Cookbook/assetic
Merge remote-tracking branch 'upstream/2.3' into 2.3
Merge branch '2.3' of git://github.com/StefTweet/symfony-docs-fr into StefTweet-2.3
Merge remote-tracking branch 'upstream/master'
Merge branch 'StefTweet-2.3'
Merge branch 'cookbook/assetic' of git://github.com/tyx/symfony-docs-fr into tyx-cookbook/assetic
Merge branch 'StefTweet-2.3' into 2.3
Merge branch 'tyx-cookbook/assetic' into 2.3
Merge pull request #267 from gregquat/2.3

2.3 (Fixing conflicts in #262 and #265)