Merge pull request #209 from mreiferson/nsq_tail_fix_209

nsq_tail: fix build
go-nsq: speed up Writer heartbeat test
go-nsq: only send on readyChan when it's a message
go-nsq: IsStarved should use *last* RDY count
go-nsq: auto-reconnect when using hard-coded nsqd addrs
go-nsq: redistribute RDY state when num_conns > max_in_flight
go-nsq: cleanup Writer exit