Merge pull request #253 from gregquat/master

Updating Book files
Merge branch '2.3'
Merge pull request #255 from StefTweet/master

Final update references @ 04 06 2013
[Cookbook] update assetic part
Update references

with last commit beetween 30 05 and 04 06
Merge remote-tracking branch 'origin/2.3'
Correct some errors in Sphinx
Merge branch '2.3'
Merge pull request #260 from StefTweet/2.3

Up to date the references Section
Merge pull request #259 from StefTweet/master

Up to date the references Section
Merge pull request #258 from tyx/cookbook/assetic

Cookbook/assetic
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 PR#262
Merge remote-tracking branch 'origine/2.3' into origin/2.3
Merge remote-tracking branch 'origine/master'
[Cookbook][Assetic] review jpeg_optimize
[Cookbook][Assetic] review yuicompressor