Update to github.com/coreos/raft
Merge branch 'master' of https://github.com/goraft/raft
Merge branch 'master' of https://github.com/goraft/raft

Conflicts:
	append_entries_response.go
	request_vote_response.go
	snapshot_recovery_request.go
	snapshot_recovery_response.go
	snapshot_request.go
	snapshot_response.go
Fix goraft reference.
Merge branch 'master' of github.com:goraft/raft into coreos