Http proxy setting, allow override of app key and placement ID
Merge pull request #105 from visenze/feature/proxy_setting [ES-10066] add setting http proxy to client config, allow override of app_key and placement_id in base params
Merge pull request #105 from visenze/feature/proxy_setting [ES-10066] add setting http proxy to client config, allow override of app_key and placement_id in base params