Significantly improve the recursive edition permission speed.
Merge pull request #919 from ngodfraind/master

Significantly improve the recursive edition permission speed.
Format method for resource manager.
Models in csv (wip)
User csv import can handle empty lines.
Merge pull request #920 from ngodfraind/bugfixes

User csv import can handle empty lines.
Merge branch 'master' of https://github.com/claroline/CoreBundle

Conflicts:
	Validator/Constraints/CsvUserValidator.php
Users import with csv can use models.
Minor fixes.
Merge pull request #921 from ngodfraind/master

User csv import with models
Workspaces can be imported by csv.
Merge pull request #922 from ngodfraind/master

Workspaces can be imported by csv.
Fixing findByMimeTypeAndParent repo method for admins.
Merge pull request #923 from ngodfraind/master

Fixing findByMimeTypeAndParent repo method for admins.
Uses withRights option recursively
Allows to fix rights when copying resource
Calls addChild method when copying a resource
Adds comments
User csv/excel export.
Merge pull request #925 from ngodfraind/master

User csv/excel export.