Refactor some of the cucumber helpers to make testing hibernate easier
Add the hibernate bundle to start exposing data through APIs

This took a little while to figure out, especially the binding of the
HibernateBundle inside of the DeployDBApp class. I had to review this code
(https://github.com/tomaslin/dropwizard-gradle-groovy/blob/master/src/main/groovy/com/example/helloworld/HelloWorldService.groovy)
a bit more to find a pattern for instantiation of the HibernateBundle that
would work in Groovy
Minor documentation update with some recent Groovy and REST API changes