Queue Processing : Consolidation of resource update processing

listener.clj
-- Now able to process a kilo queue message in a generic
way, providing support (at least at this level) for additional
resource types.

resource_accessor.clj
-- Provides generic get-data / set-data functions called from the
listener.clj.

entities.clj
-- Defines Korma entities that resource_accessor.clj references.

With these changes, messages published to the kilo queue, get
processed in a generic fashion with the entity-specific functionality
being driven by data in the message.

--Tom
Fixing type-o.