chore(controller): update django-guardian to 1.2.4

django-guardian/django-guardian@v1.1.1...v1.2.4

Author: mboersma

requirements.txt

@@ -9,7 +9,7 @@ django-allauth==0.15.0
 # HACK: use bacongobbler's feature branch until
 # https://github.com/kmmbvnr/django-fsm/pull/31 is merged
 git+https://github.com/deis/django-fsm@add-exception-handling
-django-guardian==1.1.1
+django-guardian==1.2.4
 django-json-field==0.5.5
 django-yamlfield==0.5
 djangorestframework==2.3.14