For Issue #24:

This pull request allows support for acknowledgeMode to be specified in the url so that users of this library can specify the acknowledge they need.  This is a requirement if prefetchCount is to be honored as well. 

There's a test added in src/test/java/amqp/spring/camel/component/SpringAMQPConsumerTest.java that validates that specifying prefetch + acknowledge mode doesn't cause the route to fail to load that processing of a couple of messages still works with those parameters set on the component