Remove debugging print.
Add router and conversation config options and separate out config and config-mixin classes so that apps that need to inherit their configs have easy access to the standard Vumi Go configuration options. Also remove .get_conversation() hack and correct signature for GoRouterWorker.get_config.
Fix up http_api_nostream to work with new app_worker config.
Fix up jsbox to work with the new app_worker config.
Fix up wikipedia to work with the new app_worker config.