Fixing some notification bugs + adding links.
Merge pull request #630 from ngodfraind/notifications

Fixing some notification bugs + adding links.
draft
No more error in dev mode.
WIP
Fixing migrations.
Adding new migrations.
Merge pull request #634 from ngodfraind/fixing-pf-listener

No more error in dev mode.
Merge branch 'master' of https://github.com/claroline/CoreBundle into facet-profile

Conflicts:
	Listener/UnavailablePlatformListener.php
Facet and fields can be created in the administration (backend done).