fix travis script
Merge pull request #208 from mreiferson/fix_travis_208

fix travis
nqsd: reduce the log noise when clients trigger errors
nsqd: fail to write a heartbeat is fatal
Merge pull request #207 from mreiferson/error_log_cleanup_207

nsqd: error logs cleanup
nsqd: cleanup some unnecessary exit code
nsqd: possible source of diskqueue metadata corruption?
nsqd: at tail of diskqueue force depth=0 and log errors
nsq_tail: generate a random channel
Merge pull request #190 from mreiferson/nsq_tail_safety_190

nsq_tail: safety
Merge pull request #203 from mreiferson/diskqueue_203

nsqd: diskqueue corruption and depth accounting
nsq_tail: fix import