And refactored a few names/comments

and other logging switches. I kept the u.PErr and u.POut in cli
commands, as those do need to write raw output directly.

Ipns name resolution

Conflicts:
	cmd/ipfs/ipfs.go

- cleaned up cmd help
- ipfs name publish [<name>] <ref>
- ipfs name resolve [<name>]
- publish validates <ref>
- both validate n args

cc @whyrusleeping

cc @jbenet

cc @whyrusleeping

    type NameSystem interface {
      Resolver
      Publisher
    }

should say it all.

cc @whyrusleeping

this is useful so that loggers are all setup during tests

- use log.* instead of u.*
- use automatic type conversions to .String()
  (Peer.String() prints nicely, and avoids calling b58 encoding
  until needed)