Support http.compression in connection settings

[dashkan]

Need to add "Accept-Encoding: gzip, deflate" header in order to support http.compression

http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/modules-http.html

[Mpdreamz]

Thanks for the suggestion, we will get on it as soon as we can. 👍

[Mpdreamz]

This is now implemented, you can specify new ConnectionSettings().EnableCompressedResponses() and it will start to accept gzip, deflated responses