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IPFS_LOGGING now takes a logging.Level string

(no more "all") cc @whyrusleeping

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

this is useful so that loggers are all setup during tests

- use log.* instead of u.*
- use automatic type conversions to .String()
  (Peer.String() prints nicely, and avoids calling b58 encoding
  until needed)

the u.Hash error can be safely ignored (panic) because multihash
only fails from the selection of hash function. If the fn + length
are valid, it won't error.

cc @whyrusleeping

- should not be on init, because need debug flag

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