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Role list management: name can be changed and roles can be removed.
Adding security for RolesController.
Merge pull request #680 from ngodfraind/updating-role-admin-tool

Updating role admin tool
Small ResourceVoter fix for imporsonation.
Merge pull request #681 from ngodfraind/fixing-rights-when-impersonnating

Small ResourceVoter fix for imporsonation.
Refactoring the role management interface (error handling still missing).
Patching notification for workspace subscription.
Merge pull request #685 from ngodfraind/refactoring-roles-tool

Refactoring the role management interface (error handling still missing)...
Merge pull request #686 from ngodfraind/notifications-bugfix

Patching notification for workspace subscription.