RAVE-934: Categories resource. Applying patch from Mike Jett.

git-svn-id: http://svn.apache.org/repos/asf/rave/trunk@1510970 13f79535-47bb-0310-9956-ffa450edef68
Remove CategoryList rest model

git-svn-id: http://svn.apache.org/repos/asf/rave/trunk@1511049 13f79535-47bb-0310-9956-ffa450edef68