added missing properties state and consumer_utilisation in Queue entity
added properties channel_max in Connection and global_prefetch_count in Channel
added properties state in Channel, connected_at in Connection and down_slave_nodes/messages_ram in Queue to pass travis ci runner
added property messages_ready_ram in Queue
added property messages_unacknowledged_ram in Queue
added property messages_persistent in Queue
added properties message_bytes_{ready,unacknowledged,ram,persistent} in Queue
Merge pull request #10 from robsen77/master

added missing properties state and consumer_utilisation in Queue entity