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

no-jira: add a JUnit rule to take screenshot of the browser which make an error during a selenium test, hardened the popup to create feeds

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

OO-1635: do afterserver in finally, fix some issues in selenium, make some changes to stream line the gatling tests ...

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

no-jira: fix selenium tests after the changes in the menu and navigation bar, update Selenium libraries to version 2.44.0