more performant line parsing
more performant line parsing

using []byte and string operations instead of regex
cuts off about 25% of cpu time.

vimeo/statsdaemon,raintank/statsdaemon,vimeo/statsdaemon,raintank/statsdaemon,deepglint/statsdaemon,nejec/statsdaemon,raintank/statsdaemon,vimeo/statsdaemon,ctdk/statsdaemon,shawnbutts/statsdaemon,Huangyan9188/statsdaemon