DISCO-188 publisher link

Add publisher link to settings dropdown if the features setting
is set.

cms/djangoapps/contentstore/views/course.py

@@ -648,6 +648,12 @@ def course_index(request, course_key):
         deprecated_block_names = [block.name for block in deprecated_xblocks()]
         deprecated_blocks_info = _deprecated_blocks_info(course_module, deprecated_block_names)
 
+        frontend_app_publisher_url = configuration_helpers.get_value_for_org(
+            course_module.location.org,
+            'FRONTEND_APP_PUBLISHER_URL',
+            settings.FEATURES.get('FRONTEND_APP_PUBLISHER_URL', False)
+        )
+
         return render_to_response('course_outline.html', {
             'language_code': request.LANGUAGE_CODE,
             'context_course': course_module,
@@ -667,6 +673,7 @@ def course_index(request, course_key):
                     'action_state_id': current_action.id,
                 },
             ) if current_action else None,
+            'frontend_app_publisher_url': frontend_app_publisher_url,
         })