Merge pull request #949 from ngodfraind/master

Events properly ordered.
Merge pull request #950 from ngodfraind/master

Minor improvements for the update tool.
Merge branch 'master' of https://github.com/claroline/CoreBundle
Merge pull request #951 from ngodfraind/master

Updater script.
Merge branch 'master' of https://github.com/claroline/CoreBundle