Version 1.1.0

* Changed algorithm selecting server pool from round-robin to load balancing requests and selecting server pool with the lowest waiting queue, so that requests are served with the least busy server pool. In case if there are no waiting requests, round-robin is still used to distribute requests to all servers evenly.
* Added getClusterSize()
* Added getPoolSize()
* Added availableObjectsCount()
* Added waitingClientsCount()