Changes to RabbitMQ configuration 

RabbitMQ now uses the `~/data` directory for it's database and queue storage. This means that configuration and queue data is not lost between pushes to the application.

Logs are now output to a folder that is tailed by the dashboard logs console.

Changed memory highwatermark to be based on an environment variable to make it possible to change available memory without having to edit builder file.

Updated to latest version of RabbitMQ