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Merge pull request #824 from ngodfraind/master

Fixing migrations + some bugfixes
Merge branch 'master' of https://github.com/claroline/CoreBundle into workspace-migrations
Merge branch 'workspace-migrations' into importers

Conflicts:
	Library/Transfert/ConfigurationBuilders/RolesImporter.php
	Library/Transfert/Importer.php
	Manager/TransfertManager.php
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importers can (almost) handle platform roles (see
resourceManagerImporter)
Workspaces can be created again.
Workspace can be created again.
Widget text & resource_manager can be created from templates.