Display data on RabbitMQ Status tab.

Using results from API calls to RabbitMQ server to display status info on Status tab.
Here's the docs for the API: http://hg.rabbitmq.com/rabbitmq-management/raw-file/rabbitmq_v2_8_6/priv/www/api/index.html I don't see anything about `api-aliveness-test` but I suspect Google has more details if take alook around.