nsqd: add ?binary flag to HTTP /mput
nsqd: add --statsd-prefix flag
Merge pull request #241 from mreiferson/binary_mput_241

nsqd: /mput forces line oriented data formats
nsqadmin: add --statsd-prefix
Merge pull request #269 from mreiferson/statsd_prefix_269

nsqd: add --statsd-prefix flag