event machine pure chat

poundchat -clients 140 -time 3s

140  clients  3s
140  clients exiting 0.6s

8260  msgs sent
1156400  packets received
1156400  msgs received (match)

(with 150, worst numbers)
973735  packets received
ruby-em use hashes. closer to go example

- move verbose em example
event machine bulk_chat

490 worked once for em (go and em seem similar)
(issues w/ free ports, not throughput)

thanks launchctl limit maxfiles 4096 10240
Merge branch 'eventmachine'