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not internal since io needs it

fix(fuse/ipns) use pb package

fix(fuse) import protos from unixfs/pb package

![](http://m.memegen.com/77n7dk.jpg)

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

dependencies are vendored into Godeps/_workspace and commit versions are
recorded in Godeps.json

update datastore to e89f0511
update go.crypto