Merge pull request #59 from fengjingchao/dev

finish 2 proposer conflict live test
feat(replica.go, instance.go, message.go)

use glog to print basic logs
Merge pull request #60 from yifan-gu/log

feat (replica.go, instance.go, message.go)
Merge pull request #61 from fengjingchao/dev

add live test