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

OO-1443: upgrade selenium to version 2.46 which is much quicker as 2.45 and fix an issue with Firefox 38, fix a race condition in the business gorup tree which make the links unusable, fix a upper/lower case issue if the selenium tests are run with PostgreSQL

OO-991: add some cancel buttons, show the choosed tasks in the list of coached groups and identities and other fixes

OO-991: selenium test for the group task ( individual task ) with score and automatic passed/failed, all steps made with a correction / revision step

OO-991: selenium test for the group task with standard settings and all steps made with three hands, selenium test for enrollment with unlimited sized groups ( follow a bug with this particular setting )

OO-349: selenium test for certificate manually generated by an author for a participant, rewrite publishing of the scorm course test with the new auto publish feature and use the access configuration to make it available to registrated users