Fast fix. Users can grant the access of their resources to others users.
Merge branch 'master' of https://github.com/claroline/CoreBundle into registered-user-right

Conflicts:
	Library/Installation/AdditionalInstaller.php
Removing ROLE_USER
Creates acls table if they don't exist.
Merge pull request #151 from ngodfraind/registered-user-right

Anonymous also grant access to registered users.