Merge pull request #44 from edx/cdodge/log-exception-on-callback

be sure to log any exceptions when processing callbacks from software…

edx_proctoring/callbacks.py

@@ -106,6 +106,7 @@ class ExamReviewCallback(APIView):
         try:
             provider.on_review_callback(request.DATA)
         except ProctoredBaseException, ex:
+            log.exception(ex)
             return Response(
                 data={
                     'reason': unicode(ex)