Merge pull request #96 from glorpen/master

Added PropelEventBundle to cookbook/user-contributed-behaviors
[Symfony2] Added a new section on ACL
add section on Acl implementation (copy of README)
Merge pull request #98 from havvg/patch-2

add section on Acl implementation (copy of README)
update schema inheritance section to current state
Merge pull request #97 from havvg/patch-1

update schema inheritance section to current state
Added Silex cookbook
Added Silex section in the documentation page
Fixed silex intro
Added PropelServiceProvider to the ECG
Fixed bad url
[Silex] Fixed bad presentation
[Silex] Added missing link to the project
Update support.markdown
isCrossRef added to table attributes
Merge pull request #99 from kleingeist/patch-1

isCrossRef added to table attributes
add chapter on self referencing fixtures
Merge pull request #100 from havvg/master

documentation for self referencing data loader
Add a doc on how to removeAll elements using soft-delete
Merge pull request #101 from xophm1/patch-1

Add a doc on how to removeAll elements using soft-delete