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not internal since io needs it

fix(fuse/ipns) use pb package

fix(fuse) import protos from unixfs/pb package

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

cc @jbenet

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

link errors left:
- protocol buffers output is not lint-friendly