to_nsq: add --producer-opt flag; cleanup
nsq_stat: cleanup
nsq_tail: add --consumer-opt; cleanup
nsq_to_file: add --consumer-opt; cleanup
nsq_to_http: add --consumer-opt; cleanup
nsq_to_nsq: add --consumer-opt and --producer-opt; cleanup
bump go-nsq to pickup tls-cert and tls-key
nsqd/nsqlookupd: simplify signal handling