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.