OO-2172: refactor the spring configuration to be more Spring 4 friendly, remove the cycle generate by the properties injection, deployment of course and user in a separate module

OO-1873: preload the last 100 courses on start to fill the cache, preload the course before entering an assessment mode

OO-1616: fix the certificate unit test in the REST API suite, don't doInSync during import of the course, remove get resource method (duplicate), remove unused constructor and method

OO-1768: make a complete create course method which don't use and don't need to lock on the database for a new course

OO-1733: clean up all possible references, the check to prevent deletion must happen before reaching the delete method of the service

OO-1645,OO-1595: refactor the personal configuration of calendars, the datamodel of imported calendars, make the description visible and editable...

OO-1647: remove auto-subscribe of course calendar, list of course which the user is member of and which have a calendar ( as configuration or as course element)

OO-1239: allow to delete all references of a resource in the delete process, check if the reference are orphans, managed, owned...

OO-1408: improve performance with native SQL queries, add all queries needed for authors to see their courses and the groups linked to their courses

OO-1182: pass the toolbar as constructor to initialize all sub controller with it, independent of the timing of this initialization

OO-990: only retrieve the roles once, use them for all access security control, retrieve the groups only if the roles coach, participant or waiting are there... to minimize the number of queries

OO-1000: fix an issue with the edition of coach role of course, fix some issues with the views of the coaching tool

OO-990: mostly fix of the authoring GUI, and unit tests, integrate the demo course to the test resource

OO-990: rework importation of course node with references, implement autowiring capabilities in controllers