Resolve "Register different import tasks/methods"

Closes #8 (closed)

aleksis/apps/untis/management/commands/untis_import_mysql.py

 from django.core.management.base import BaseCommand
 
-from ...tasks import untis_import_mysql
+from ...tasks import untis_import_mysql_current_term
 
 
 class Command(BaseCommand):
     def handle(self, *args, **options):
-        untis_import_mysql()
+        untis_import_mysql_current_term()