Update references

with last commit beetween 30 05 and 04 06
Correct some errors in Sphinx
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
[Cookbook][Assetic] review jpeg_optimize
[Cookbook][Assetic] review yuicompressor