Support bearer token auth with API keys?

[benley]

This script currently requires that Grafana have basic http authentication enabled, but some teams prefer to disable it in favor of oauth2 or other federated logins. Grafana does have a method for bearer token auth with API keys, and it would be nice if this script could use it: http://docs.grafana.org/http_api/auth/

[yacut]

Unfortunately, I don't have time for this right now, but feel free to make a pull request :)