issue #381 - ASSIGNED: Cannot run two streaming sessions simultaneously (with different launches) 
http://agalaldev.info/dev/mantis/view.php?id=381

- Changing how sessions are stored in VideoManager, as from now: old sessions are discarded and new instances are created to assure the release of old sessions' resources
Merge branch 'master' of https://github.com/ahgalal/ovap