Added a setting where the exported excel files should be stored.

Added a option to send the exported excel as mail attachment.

src/events/models.py

@@ -4,7 +4,7 @@ import os
 from ckeditor.fields import RichTextField
 from django.conf import settings
 from django.core.exceptions import ValidationError
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 from django.db import models
 from django.db.models import Q
 from django.template.defaultfilters import slugify

src/events/views.py

@@ -3,7 +3,7 @@ from datetime import timedelta
 
 from django.contrib.auth import get_user_model
 from django.contrib.auth.mixins import PermissionRequiredMixin
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 from django.db.models import Q
 from django.http import HttpResponse, Http404
 from django.shortcuts import redirect