feat(daemon) `ipfs daemon --initialized`

With this PR, users can fetch and run ipfs in _one_ command.

```
docker run -d -p 4001:4001 -p 5001:5001 jbenet/go-ipfs daemon --initialized
```

Magic.

nb: needs https://github.com/jbenet/go-datastore/pull/9
is `PoliteJSON` a `logrus` construct? Is there a difference between `PoliteJSON` and `PrettyJSON` ? ("pretty printing" is already well known)