chore(controller): update djangorestframework to 2.3.14

Several months of cleanup and bug fixes to a core Deis library:
encode/django-rest-framework@2.3.13...2.3.14

Author: mboersma

requirements.txt

@@ -12,7 +12,7 @@ git+https://github.com/deis/django-fsm@add-exception-handling
 django-guardian==1.1.1
 django-json-field==0.5.5
 django-yamlfield==0.5
-djangorestframework==2.3.13
+djangorestframework==2.3.14
 docker-py==0.4.0
 gunicorn==18.0
 psycopg2==2.5.2