adding default help; changing messages to reflect student situation
adding some sample questions to the help template
migrating to use Settings instead of settings, so no server reload is necessary.
migrating to using config.Settings instead of settings
implementing a settings cache, to avoid performance issues accessing the database.  NOTE that the Django admin does NOT go through the config models code, so change in the admin interface requires restarting the server
Merge branch 'web_editable_settings' into local_help

Conflicts:
	kalite/urls.py
removing contact forms