Fixes #523: instance doesn't start when one of the addresses is not reachable
Fixes #281: optimization: call only once : HazelcastClient.getMap -> mapProxies.get(o)
Merge pull request #526 from pveentjer/fix/2.x/optimize-HazelcastClient-getClientProxy

Fixes #281: optimization: call only once : HazelcastClient.getMap -> map...
Merge pull request #525 from pveentjer/fix/2.x/host-not-reachable

Fixes #523: instance doesn't start when one of the addresses is not reac...
Cleanup.
* fix #397: HazelcastClient putAll throws NullPointerException if called with empty map
Merge pull request #527 from pveentjer/fix/2.0/map-putall-fails-with-empty-map

* fix #397: HazelcastClient putAll throws NullPointerException if called...