Integrated credstash as a live properties setting in the app.py class

- initial versions kept it out of this class but updated as lots of duplication and errors as config
set up in multiple places and not all picking up credstash.

db.py

@@ -1,5 +1,3 @@
-from app import create_app
-import os
 from credstash import getAllSecrets
 from flask.ext.script import Manager, Server
 from flask_migrate import Migrate, MigrateCommand
@@ -7,7 +5,7 @@ from app import create_app, db
 
 secrets = getAllSecrets(region="eu-west-1")
 
-application = create_app(os.getenv('NOTIFICATIONS_ADMIN_ENVIRONMENT') or 'live')
+application = create_app('live')
 
 for key in application.config.keys():
         if key in secrets: