Add checking consumer count on multiple rabbitmq queues

Allows passing in a comma separated list of queue names to check
Returns the names of queues in critical/warn state as well as any missing queues
Renames the class so the correct name is returned in errors (CheckRabbitMQConsumers  vs CheckRabbitMQMessages)
Add myself on the copyright
Merge pull request #877 from tas50/rmq_queues

Add checking consumer count on multiple rabbitmq queues