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.

wsgi.py

@@ -1,22 +1,6 @@
 from app import create_app
-import os
-from credstash import getAllSecrets
-from flask.ext.script import Manager, Server
-from flask_migrate import Migrate, MigrateCommand
-from app import create_app, db
 
-secrets = getAllSecrets(region="eu-west-1")
-
-application = create_app(os.getenv('NOTIFICATIONS_ADMIN_ENVIRONMENT') or 'live')
-
-for key in application.config.keys():
-        if key in secrets:
-                application.config[key] = secrets[key]
-
-
-manager = Manager(application)
-migrate = Migrate(application, db)
-manager.add_command('db', MigrateCommand)
+application = create_app('live')
 
 if __name__ == "__main__":
         application.run()