Add event type list api view.

mayan/apps/events/api_views.py

@@ -0,0 +1,15 @@
+from __future__ import unicode_literals
+
+from rest_framework import generics
+
+from .classes import Event
+from .serializers import EventSerializer
+
+
+class APIEventTypeList(generics.ListAPIView):
+    """
+    Returns a list of all the available event types.
+    """
+
+    serializer_class = EventSerializer
+    queryset = sorted(Event.all(), key=lambda event: event.name)