godep: bump github.com/codegangsta/cli
etcdctl: break out getPeersFlagValue
etcdctl: break out mustNewMembersAPI
client: explicitly carry API prefix around
client: move timeout into caller of httpClient
client: introduce httpActionDo interface
client: introduce httpClusterClient
client: accept slice of endpoints
etcdctl: wire up --peers for member commands
client: use v2MembersURL helper
Merge pull request #1541 from bcwaldon/client-peers

Use `-peers` in `etcdctl members` commands