Merge pull request openedx#508 from Stanford-Online/dcadams/fix_oli_e…

…vent_handler

Alter anonymous_id to user_id.

common/djangoapps/track/backends/oli.py

@@ -109,7 +109,7 @@ def send(self, event):
             'payload': {
                 'course_id': course_id,
                 'resource_id': problem_id,
-                'student_id': anonymous_id_for_user(user, None),
+                'user_id': user_id,
                 'grade': grade,
                 'max_grade': max_grade,
                 'timestamp': timestamp.isoformat(),