Babbitty Rabbitty and her Cackling Queue

This pull request has several related changes to the rabbitmq module.
 *  Improved command line debugging
 * Configurable logging (std stream/syslog)
 * Support for per exchange metrics
 * Configuration to enable/disable exchange/node/queue metrics.  Previously all metrics would be displayed (many per queue) which is not suitable in all configurations.
 * Fewer digressions from standard python formatting (pep8)