[FIX] Exception caused by groups in submitters

 * Code not prepared to handle groups;
[IMP] Chairpersons submission rights

* Change 'add chairperson' widget for conferences, meeting and lectures
* Submitters added to AccessController class
* Add possibility to manage materials through event (conference,
* meeting, lecture) main page
[IMP] Add email pending queue for event submitters
[IMP] Give submission rights when creating event
[FIX] Warning popup when adding new submitter
[IMP] Add submission options for managers

* Put material widget directly on event main page
[IMP] Manage materials for conference submitters

* Small fixes after rebase
[IMP] Material edit icon transition effects
[FIX] Some fixes on new submitters for confs
[FIX] Material css highlight only for submitters
[FIX] Remove internationalization pending notif.
[FIX] Submission rights for admins and managers
[FIX] Replace submitterEmailList with pendingQueue

* fix index name
* clean code
[FIX] Refactor conf and contrib submitters code
[FIX] Migration scheduler tasks - missing checking
[FIX] Some fixes on prev ticket and grantRights in activate
[FIX] Remove from pending when editing chair email
Merge branch 'v1.0'

Conflicts:
	indico/MaKaC/conference.py