Misleading method argument names

[AlexandreRio]

Correct me if I'm wrong but it seems that the dashboard methods are expecting uids and not names.
So getDashboard and others cannot work as expected from the README and the javadoc.

See:

• http://docs.grafana.org/http_api/dashboard/
• https://appnexus.github.io/grafana-api-java-client/com/appnexus/grafana/client/GrafanaClient.html#getDashboard-java.lang.String-