Ipns name resolution

This branch is not yet complete, but before i move forward, the name resolution code (in namesys) needs some critiquing. There are also a decent number of bugfixes in this branch that i ran into while trying to get the code to a point where i could test ipns.
Should be:
```Go
fmt.Fprintf(out, "published mapping %s to %s\n", u.Key(hash).Pretty(), args[0])
```