new Service interface

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