update readme
Update readme
feat(etcd): use hostname as machine name

by default I don't want etcd to require parameters so people can rapidly
try it out. Try to use the hostname as the name instead.
Merge pull request #283 from philips/use-hostname-as-machine-name

feat(etcd): use hostname as machine name
fix typo
Merge pull request #268 from xiangli-cmu/0.2-readme

update readme
feat use-raft-protobuf
feat add a simple speed test
Merge pull request #290 from xiangli-cmu/feat-use-raft-protobuf

feat use-raft-protobuf
Update migration script.
Merge branch '0.2' of https://github.com/coreos/etcd into migration-test