Show class teacher and deputy class teacher on plan views

closes #331

biscuit/apps/untis/api.py

 from django.conf import settings
 
-from untisconnect.api_helper import get_term_by_ids, run_using, untis_date_to_date, date_to_untis_date
+from untisconnect.api_helper import get_term_by_ids, run_using, untis_date_to_date, date_to_untis_date, \
+    untis_split_first
 from . import models
 from timetable.settings import untis_settings
 
@@ -8,8 +9,6 @@ TYPE_TEACHER = 0
 TYPE_ROOM = 1
 TYPE_CLASS = 2
 
-from datetime import date
-
 
 def run_all(obj, filter_term=True):
     return run_default_filter(run_using(obj).all(), filter_term=filter_term)
@@ -118,6 +117,7 @@ class Class(object):
         self.text1 = None
         self.text2 = None
         self.room = None
+        self.teachers = []
 
     def __str__(self):
         if self.filled:
@@ -138,6 +138,9 @@ class Class(object):
         self.name = db_obj.name
         self.text1 = db_obj.longname
         self.text2 = db_obj.text
+        teacher_ids = untis_split_first(db_obj.teacherids, int)
+        self.teachers = [get_teacher_by_id(t_id) for t_id in teacher_ids]
+        print(self.teachers)
         # print(db_obj.room_id)
         if db_obj.room_id != 0:
             #   print("RAUM")