Added users import into a group + some tests
Merge remote-tracking branch 'upstream/master' into import-users-from-csv-to-group

Conflicts:
	src/core/Claroline/CoreBundle/Entity/Group.php
	src/core/Claroline/CoreBundle/Manager/GroupManager.php
Added tests for GroupManager
Added remaining tests for UserManager
Added flashbag for users import
Refactored use order in UserManager
Refactored demo fixture
Added tests for AdministrationController. Closes #117
Merge remote-tracking branch 'upstream/master' into import-users-from-csv-to-group
Refactored AbstractWorkspace entity
Merge remote-tracking branch 'upstream/master' into allow-workspace-self-registration
Added self-registration in workspace parameters
Fixed weird netbeans bug
Merge pull request #150 from stefk/gitignore-fix

Fixed weird netbeans bug
Default Theme update
Merge pull request #151 from solispauwels/GUI

Default Theme update
Added displayable workspaces page + selfRegistration config
Merge remote-tracking branch 'upstream/master' into restore-demo-fixtures
Fixed message fixture
Removed commented code and double quotes