Fix: Upgrade django to 1.11 LTS

New version of django fix the RuntimeError while saving wepb file.

The patch will not be applied to Django 1.8

Ref: https://www.djangoproject.com/download/#supported-versions

Ref: https://github.com/django/django/pull/10331

core/urls.py

@@ -1,4 +1,4 @@
-from django.conf.urls import patterns, include, url
+from django.conf.urls import include, url
 from django.views.generic import TemplateView
 
 from tastypie.api import Api
@@ -13,7 +13,7 @@ v1_api.register(ThumbnailResource())
 v1_api.register(PinResource())
 v1_api.register(UserResource())
 
-urlpatterns = patterns('',
+urlpatterns = [
     url(r'^api/', include(v1_api.urls, namespace='api')),
 
     url(r'^pins/pin-form/$', TemplateView.as_view(template_name='core/pin_form.html'),
@@ -28,4 +28,4 @@ urlpatterns = patterns('',
         name='recent-pins'),
     url(r'^$', TemplateView.as_view(template_name='core/pins.html'),
         name='recent-pins'),
-)
+]