OO-1867: upgrade selenium and arquillian libraries to support Firefox 46 and update the tests to work with them

no-jira: add selenium test for the direct deletion of user, remove empty info in the panel to create a business group, add the missing parameter of the uploaded by i18n key in different languages

no-jira: use javascript to fill the import textarea as copy/paste is not supported on the different browsers and platforms i want, add a selenium test which import an existing user and change its last name and password

OO-1068: 1 selenium test to test a catalog round trip, create categories in catalog, create course, add it to catalog, open my courses, navigate catalog until course is open