Add the dagjose multiformat

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[alexjg]

I guess that's so that client code can generically go from codec name to the actual multicodec value? E.g this code in go-ipfs:

        if codecStr != "" {
            codec, ok := cid.Codecs[codecStr]
            if !ok {
                return fmt.Errorf("unknown IPLD codec: %s", codecStr)
            }
            opts.newCodec = codec
        } // otherwise, leave it as 0 (not a valid IPLD codec)

[alexjg]

Hey folks, is there anything more that needs doing on this? Would be great to get it merged.

[rvagg]

I've just realised I have merge access on this repo so could get this merged. There's something wrong with the codecov report though and I can't re-run it. Would you mind bumping the commit so it'll re-run please? The repo rules stop me overriding it unfortunately.

[alexjg]

Hmm, I've tried bumping the commit and it looks like it's still causing problems. I can't really figure out why there are coverage changes, the codecov output doesn't seem particularly enlightening.

[rvagg]

Your commit accidentally slipped in via #115 (I must have been messing around with trying to get this in from the cmdline and had it on my master so it slipped in via a rebase). But that's OK because I was trying to get it in anyway! Done now.