Stolon v0.2.0

• A stolon client (stolonctl) is provided. At the moment it can be used to get list clusters, get cluster status and get/replace/patch cluster config (#28 #64). In future multiple additional functions will be added. See doc/stolonctl.md.
• The cluster config is now configurable using stolonctl (#2). See doc/cluster_config.md.
• Users can directly put their preferred postgres configuration files inside a configuration directory ($dataDir/postgres/conf.d or provided with --pg-conf-dir) (see doc/postgres_parameters.md)
• Users can centrally manage global postgres parameters. They can be configured in the cluster configuration (see doc/postgres_parameters.md)
• Now the stolon-proxy closes connections on etcd error. This will help load balancing multiple stolon proxies (#74 #76 #80).
• kubernetes: added readiness probe for stolon proxy (#82)
• The keeper takes an exclusive fs lock on its datadir (#48)
• Numerous bug fixes and improved tests.

Docker images (the same used in the kubernetes example can be found on docker hub