anchor.diff:  The `status` field records the state of the state machine (below) the
   slot is in.
   
  -If the slot is running, successful, or failed, the `externalID` field
  -contains the Oozie ID of the corresponding Oozie workflow execution
  +The `externalID` field contains the Oozie ID of the corresponding
  +Oozie workflow execution if the slot is running, successful, or failed
   (otherwise `externalID` is null).
   
   The `retryCount` records how many times the slot has already been
  
positive.code: ....
  
  An individual slot file in the state database,
  e.g. db/state/wordcount-lax/2015-09-15/01:00:00.000Z looks like this:
  
  ....
  {
  
negative.code: 
  === How it works
  
  The main data sources Celos uses are:
  
  ==== Workflows Directory
  
  