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
Added tests for AdministrationController. Closes #117
Merge remote-tracking branch 'upstream/master' into import-users-from-csv-to-group
Merge remote-tracking branch 'upstream/master' into import-users-from-csv-to-group

Conflicts:
	src/core/Claroline/CoreBundle/Tests/Manager/UserManagerTest.php
Submodule update
Merge remote-tracking branch 'upstream/master' into import-users-from-csv-to-group
Merge pull request #146 from kitan1982/import-users-from-csv-to-group

Import users from csv to group