Add EAP 6.1 as a supported runtime for archetypes

The latest build of JBDS 7 now supports addition of EAP 6.1 server.
So I wanted to try an archetype from JBoss Central and it shows that no supported runtime is present in Eclipse. That's because https://github.com/jboss-jdf/jdf-stack/blob/1.0.0.Final/stacks.yaml doesn't include EAP 6.1 in the list of supported runtimes for each archetype.

Could that be added? But first the archetypes should be tested to actually work with EAP 6.1.

Also, I don't know exactly how to solve that fact that there is probably no finalized maven repo and bom versions for EAP 6.1, so I'm not sure how to solve it. For now I wanted to just manually set enterprise=false.