anchor.diff:                  "module_code": "CS1010",
                   "lesson_type": "tutorial",
                   "class_number": "2",
  +            },
  +            {
  +                "module_code": "CS1010",
  +                "lesson_type": "sectional",
  +                "class_number": "1",
  +            },
  +            {
  +                "module_code": "CS1231",
  +                "lesson_type": "sectional",
  +                "class_number": "1",
               }
           ]
   
  
positive.code:                 "module_code": "CS1010",
                  "lesson_type": "tutorial",
                  "class_number": "2",
              }
          ]
          
  
negative.code: ### Get Timetable for year and sem [GET]
  
  + Response 200 (application/json)
          
          {
              "last_synced": "2016-09-08T00:09:35+00:00",
              "data": [
                  {
                      "module_code": "CS1010",
                      "lesson_type": "sectional",
                      "class_number": "1"
                  }
              ]
          }
  
  ### Update modules in Timetable [POST]
  
  Timetable will be updated with all module data given in post request.
  The response is the complete timetable for year and sem with the module added.
  
  + Request (application/json)
  