more configurable better connection management for http client

git-svn-id: https://svn.apache.org/repos/asf/incubator/sirona/trunk@1576556 13f79535-47bb-0310-9956-ffa450edef68
make this more configurable

git-svn-id: https://svn.apache.org/repos/asf/incubator/sirona/trunk@1576557 13f79535-47bb-0310-9956-ffa450edef68
add an async httpclient
more configuration
No need to build so many Cube instances

git-svn-id: https://svn.apache.org/repos/asf/incubator/sirona/trunk@1576558 13f79535-47bb-0310-9956-ffa450edef68