Centralize startup code, and execute in all contexts

Inspired by: http://eldarion.com/blog/2013/02/14/entry-point-hook-django-projects/
Moves startup code to lms.startup and cms.startup, and calls the startup
methods in wsgi.py and manage.py for both projects.

cms/urls.py

@@ -1,9 +1,9 @@
 from django.conf import settings
 from django.conf.urls import patterns, include, url
 
-# Import this file so it can do its work, even though we don't use the name.
-# pylint: disable=W0611
-from . import one_time_startup
+# TODO: This should be removed once the CMS is running via wsgi on all production servers
+import cms.startup as startup
+startup.run()
 
 # There is a course creators admin table.
 from ratelimitbackend import admin