Removed category useless files and fix bug of no category message
Can link a workspace to a category
Updated workspace link page and workspaces list GUI
Update admin registration into workspace to handle workspace linked to category
Merge branch 'master' of https://github.com/claroline/CoreBundle into associate_workspace_to_category
Fixes GUI bug of workspace linked to incorrect category
Merge pull request #622 from kitan1982/associate_workspace_to_category

Associate workspace to category