Merge pull request #10 from fengjingchao/dev

add fastquorum size
before merge
Merge branch 'dev' of github.com:go-epaxos/epaxos into dev
simple accept, acceptreply, and commit stuff, and corresponding tests
delete a blank line
&InstanceInfo{} -> new(InstanceInfo)
no need for ballot in commit
some silly comments
add 'else' in recvCommit
checkout phase1, remember to delete blank lines pls
Merge pull request #11 from yifan-gu/dev

after discussion, agree on merge
Merge branch 'dev' of github.com:go-epaxos/epaxos into dev

Conflicts:
	replica/instance.go
	replica/phase1_test.go