OO-1926: added formaDateRelative to formatter to add a specific period of time to a baseline date and format it short. made it available in the phantomJS certificates

OO-1853: deduplicates the list of collections for security, remove a possible QuestionItemImpl from the cache for the lock

no-jira: close the upgrader for 10.4, better error handling to take screenshots of selenium tests on error

OO-1819: add param for inital author, add param to not set the initial author, return more infos for course members

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