tweaking settings for compatibility with heroku

Procfile

-web: gunicorn heliosserver.wsgi:application -b 0.0.0.0:8000
+web: gunicorn wsgi:application
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+worker: python manage.py celeryd -E -B --beat
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runtime.txt

+python-2.7.5

settings.py

@@ -24,6 +24,11 @@ DATABASES = {
     }
 }
 
+# override if we have an env variable
+if get_from_env('DATABASE_URL', None):
+    import dj_database_url
+    DATABASES['default'] =  dj_database_url.config()
+
 # Local time zone for this installation. Choices can be found here:
 # http://en.wikipedia.org/wiki/List_of_tz_zones_by_name
 # although not all choices may be available on all operating systems.