Merge pull request #885 from kitan1982/bugfix

Fixes back button in admin roles list
Adds var isVisible in ResourceNode
Updates ResourceNode properties form
Adding forceArchive option.

Usefull if you wanna keep the folders and architecture while you have only 1 real file.
A role can be set when users are manually imported with CSV.
Merge pull request #888 from ngodfraind/bugfixes

A role can be set when users are manually imported with CSV.
Adding redirection.
Merge branch 'master' of https://github.com/claroline/CoreBundle into bugfixes
Merge pull request #889 from ngodfraind/bugfixes

Bugfixes
Merge pull request #887 from bradInside/adding_forceArchive_option

Adding forceArchive option.
NULL not merged to the em anymore.
Merge pull request #890 from ngodfraind/bugfixes

NULL not merged to the em anymore.
Refactoring workspace creation.
Fixing a bug happening when importing a csv with no user role.
Merge pull request #891 from ngodfraind/master

Fixing a bug happening when importing a csv with no user role.
Merge branch 'master' of https://github.com/claroline/CoreBundle into bugfixes
Allows visibility mode to be switched in resources manager
Adds visibility button info translations
Merge branch 'master' of https://github.com/claroline/CoreBundle into resource-visible-option
Merge pull request #892 from kitan1982/resource-visible-option

!!! NEW MIGRATIONS!!! Resource visible option