Zendesk Proxy

This change creates a new lms/cms endpoint which accepts unauthenticated
requests to securely create zendesk tickets. This allows javascript code to
create tickets without exposing ZENDESK_OAUTH_ACCESS_TOKEN

EDUCATOR-1889

cms/urls.py

@@ -152,7 +152,8 @@ urlpatterns = [
         name='group_configurations_detail_handler'),
     url(r'^api/val/v0/', include('edxval.urls')),
     url(r'^api/tasks/v0/', include('user_tasks.urls')),
-    url(r'^accessibility$', contentstore.views.accessibility, name='accessibility')
+    url(r'^accessibility$', contentstore.views.accessibility, name='accessibility'),
+    url(r'^zendesk_proxy/', include('openedx.core.djangoapps.zendesk_proxy.urls')),
 ]
 
 JS_INFO_DICT = {