Merge pull request #2 from yifan-gu/master

test dependencies
another file structure
Merge branch 'master' of github.com:go-epaxos/epaxos

Conflicts:
	replica/instance_test.go
	replica/message.go
Merge pull request #3 from fengjingchao/master

another file structure
before merge
after merge
finish acceptedProcess, need test