* Expose new `apiHost` option on `init()` and `BufferedMetricsLogger` constructor. This makes it possible to actually configure the Datadog site to submit metrics to. For example, you can now submit metrics to Datadog’s Europe servers with:

    ```js
    const metrics = require('datadog-metrics');
    metrics.init({
        apiHost: 'datadoghq.eu'
    });
    ```

    (Thanks to @ErikBoesen.)