Allow to filter events with type teacher_timetable_slot

Author: jirutka

app/api/events_endpoints.rb

@@ -57,7 +57,7 @@ def represent(dataset)
         optional :deleted, type: String, regexp: /\A(true|false|yes|no|on|off|t|f|y|n|1|0|all)\z/i, default: 'false'
       end
       params :event_type do
-        optional :event_type, type: String, values: %w{assessment course_event exam laboratory lecture tutorial}
+        optional :event_type, type: String, values: %w{assessment course_event exam laboratory lecture teacher_timetable_slot tutorial}
       end
       params :filter_events do
         use :pagination

docs/Sirius.raml

@@ -71,7 +71,7 @@ traits:
         event_type:
           description: Filter by event's type
           type: string
-          enum: [ assessment, course_event, exam, laboratory, lecture, tutorial ]
+          enum: [ assessment, course_event, exam, laboratory, lecture, teacher_timetable_slot, tutorial ]
   - includable:
       description: >
         Includes the specified linked resources into the response (similar to compound documents