GUI update
Merge remote-tracking branch 'upstream/master'
Merge pull request #158 from solispauwels/master

GUI update
Updating ResourceVoter.
Merge pull request #159 from ngodfraind/resource-voter-is-granted-refactor

Updating ResourceVoter.
User can send message to all users in the same workspace and groups he is subscribed in
Merge branch 'master' of https://github.com/claroline/CoreBundle into message-user-contact-list
Set workspace auto-selfregistration by default
Displayed all workspaces user can unsubscribed in unsubscribe page
Fixing ResourceVoter
Merge pull request #160 from kitan1982/message-user-contact-list

Message user contact list
Merge pull request #161 from kitan1982/workspace-unsubscribe

Workspace unsubscribe
user-lists do not display every roles.
Merge pull request #162 from ngodfraind/list-roles-userpics

List roles userpics
Correct AuthenticatedUserConverter, additional options + minor debug
Merge remote-tracking branch 'upstream/master'
Merge pull request #163 from Vaince/master

Correct AuthenticatedUserConverter, additional options + minor debug
Refactored workspace tag management
Changed display after adding/removing subcategory
Displayed all categories where workspaces will be put