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Fixes #157
Found #158

new Service interface

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

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

cc @jbenet

    type NameSystem interface {
      Resolver
      Publisher
    }

should say it all.

cc @whyrusleeping

working on dag modification structures, factored out the data format into an importer subpackage and added more ipns tests

+ added recursive pinning func