todo
configurable circuit breaker
memcache config circuit breaker
fix the stupid bug
sleep more before output stats
ping only mode
remove verbose member var
circuit open error
use net.Addr as key is more reasonable
memcache circuit breaker done
discard
rm a duplicated method, rm misunderstanding
rearrange src
mongodb circuit breaker done
uri is more than url
doc
rm dup log
export servant err to rpc client
adjust log messages
rpc server logging msg capitalized