Force target compatibility to start at JDK6
Start adding some stub classes with the needed data attached to them

Relates to #2
Add a simple default constructor for whoas library consumers to use
Add support for supplying your own Queue implementation to the InMemoryQueue

This will make it a bit easier to test inside of Spock with pre-configured/set
up queues
Finish implementing the InMemoryQueue

This will provide just the simplest of queueing operations for testing of Whoas
but also for integration testing in users of Whoas

Fixes #2