Connect to already running daemon

After talking to @dryajov, we noticed that `ipfsd-ctl` doesn't connect to already running daemons. This code:

```
DaemonFactory.create().spawn({
  repoPath: "/a/beautiful/path",
  disposable: false,
  init: false,
  start: false
}, (err, node) => { console.log(node.started) })
```

Should print `true` if the there was a daemon on that repo and `node.api` should be populated. 😄 