Use normal style of JSON in `myip` output
Use normal style of JSON in `myip` output

Go uses the convention of uppercasing exported fields, but it makes the
JSON output it generates horribly ugly (keys should be lowercase).  Use
`reflect` to fix the defaults through a custom `MarshalJSON` function.

Old format:

    {
      "IP": "172.17.0.7",
      "Loopback": false,
      "V6": false,
      "Name": "eth0",
      "Wireless": false
    }

New format:

    {
      "ip": "172.17.0.7",
      "loopback": false,
      "name": "eth0",
      "v6": false,
      "wireless": false
    }

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