tweak settings/wsgi to use whitenoise for heroku

bakerydemo/heroku_wsgi.py

@@ -1,6 +1,5 @@
+from django.core.wsgi import get_wsgi_application
 from whitenoise.django import DjangoWhiteNoise
 
-from .wsgi import application as _application
-
-
-application = DjangoWhiteNoise(_application)
+application = get_wsgi_application()
+application = DjangoWhiteNoise(application)

bakerydemo/settings/heroku.py

@@ -18,6 +18,11 @@ BASE_URL = 'http://localhost:8000'
 db_from_env = dj_database_url.config(conn_max_age=500)
 DATABASES['default'].update(db_from_env)
 
+# Simplified static file serving.
+# https://warehouse.python.org/project/whitenoise/
+
+STATICFILES_STORAGE = 'whitenoise.django.GzipManifestStaticFilesStorage'
+
 try:
     from .local import *
 except ImportError: