[ui][registration][models] supervision_request signal emission

Fixes #496

beat/web/ui/registration/models.py

@@ -44,6 +44,7 @@ from django.utils.translation import ugettext_lazy as _
 from ...accounts.models import SupervisionTrack
 from ...accounts.models import Profile
 from ...accounts.models import TemporaryUrl
+from ...accounts.signals import supervision_request
 from ...utils import mail
 
 SHA1_RE = re.compile("^[a-f0-9]{40}$")
@@ -162,6 +163,8 @@ class RegistrationManager(models.Manager):
                         [supervisor_user.email],
                     )
 
+                    supervision_request.send(supervisiontrack)
+
                 return user
         return False