Updated to work with Hapi 6.x.x and changed the options signature to match the statsd-client module

Updated the project to conform to the new plugin interface of Hapi. Also updated the statsd part of the plugin configuration to more align with the statsd-client module.

### v0.4.1

```javascript
{
    statsdHost: "localhost:8125"
}
```

### v0.5.0
```javascript
{
    host: "localhost",
    port: "8125"
}
```

This is a trivial change to revert if the old signature is preferred. I only changed it to make things a little easier for an external project. It would be trivial for me to conform.