Merge pull request #136 from wagtail/134-images-heroku

Have images on initial Heroku deployment

Procfile

@@ -1,2 +1,2 @@
 release: yes "yes" | python manage.py migrate
-web: uwsgi --http-socket=:$PORT --master --workers=2 --threads=8 --die-on-term --wsgi-file=bakerydemo/wsgi_production.py
+web: uwsgi --http-socket=:$PORT --master --workers=2 --threads=8 --die-on-term --wsgi-file=bakerydemo/wsgi_production.py  --static-map /media/=/app/bakerydemo/media/ --offload-threads 1