doc(test_plan.md)

change naming, from receiver to proposer.
Merge pull request #54 from yifan-gu/livetest

doc(test_plan.md)
livetest:

finish 3 replica, non-conflict, 1 proposer and 3 proposers
test partitial depency
Merge pull request #56 from yifan-gu/livetest

livetest:
chore(livereplica_test.go)

add livetestlibLogConsistent() to help check the log consistency amoung replicas
Merge pull request #58 from yifan-gu/livetest

chore(livereplica_test.go)
finish 2 proposer conflict live test