anchor.diff:  ### List All Departments [GET]
   
   + Response 200 (application/json)
  -    
       + Attributes (array[Department], required, fixed-type)
   
   ### Post Departments [POST]
   
   + Request (application/json)
  -
       + Attributes
           + departments (array, required, fixed-type)
               + (object)
  
positive.code:             
  
  + Response 404 (application/json)
  
      + Attributes
          + message: class does not exist (string, required, fixed)
              
  
negative.code:     + professor_id (optional, number) - Limit the list to courses that were taught by the specified professor
  
  + Response 200 (application/json)
      + Attributes (array[Course], fixed-type)
  
  ### Post Courses [POST]
  
  + Request (application/json)
      + Attributes
          + courses (array, fixed-type)
              + (object, required)
  