Update index document types view to AddRemoveView

Add index create and edit events.

Signed-off-by: Roberto Rosario <roberto.rosario.gonzalez@gmail.com>

mayan/apps/document_indexing/events.py

@@ -0,0 +1,16 @@
+from __future__ import absolute_import, unicode_literals
+
+from django.utils.translation import ugettext_lazy as _
+
+from mayan.apps.events.classes import EventTypeNamespace
+
+namespace = EventTypeNamespace(
+    label=_('Document indexing'), name='document_indexing'
+)
+
+event_index_template_created = namespace.add_event_type(
+    label=_('Index created'), name='index_created'
+)
+event_index_template_edited = namespace.add_event_type(
+    label=_('Index edited'), name='index_edited'
+)