Enable client auth env var on heroku

app.json

@@ -4,6 +4,7 @@
     "postdeploy": "python manage.py db upgrade"
   },
   "env": {
+    "CLIENT_AUTH": {"required": true},
     "GEOSERVER_AUTH_USER": "username",
     "GEOSERVER_AUTH_PASS": "securepassword",
     "GEOSERVER_DATASTORE": "data",

kepler/settings.py

@@ -14,6 +14,7 @@ class DefaultConfig(object):
 
 class HerokuConfig(DefaultConfig):
     def __init__(self):
+        self.CLIENT_AUTH = os.environ['CLIENT_AUTH']
         self.SQLALCHEMY_DATABASE_URI = os.environ['DATABASE_URL']
         self.SECRET_KEY = os.environ['SECRET_KEY']
         self.GEOSERVER_PUBLIC_URL = os.environ['GEOSERVER_PUBLIC_URL']