use gzip compression to transport data

git-svn-id: https://svn.apache.org/repos/asf/incubator/sirona/trunk@1573398 13f79535-47bb-0310-9956-ffa450edef68
using compression must be configurable and off per default

git-svn-id: https://svn.apache.org/repos/asf/incubator/sirona/trunk@1573399 13f79535-47bb-0310-9956-ffa450edef68