Create multiple Consumers in one call.

grails create-consumer my.package.AlphaConsumer my.package.Beta

yields:

grails-app/rabbit-consumers/my/package/AlphaConsumer.groovy
grails-app/rabbit-consumers/my/package/BetaConsumer.groovy
create unit test too.
Merge pull request #1 from michaelrice/multiple_creation_call

create unit test too.
Merge pull request #5 from aaron-brown/multiple_creation_call

Create multiple Consumers in one call.