CYB-85 Move servics from app/models to app/services
CYB-85 Move servics from app/models to app/services.  Making API more consistent internally and with Rails standards.
CYB-85 spec cleanup for service renaming.
Hooked up Engagement Index with API; Also can query DB for Engagement Index Data
Moving the iteration for the return values from the 'entries' API call to the caller (#call)
  from the called helping function, #process_children.  This makes #process_children have a
  similar signature to #call, differing only in taking an Array (of Hashes) rather than a Hash.

Cron functionality WORKING for activity stream processing.
 * Worker added, calling a service object
 * Setup changes documented in README.md