make sure exceptions that go all the way up the django stack are logged in our error logs when DEBUG=False

--HG--
rename : settings.py => settings_old_askbot.py

Removed simplewiki's custom 404 page so urls work better, and it uses global 404 page. Set bad debug setting to false

settings.py had textbook. Worked on dev machines because .pyc files stuck around; didn't work on staging

Added setting to generate random user credentials to test account creation. Might have accidentally stomped other changes to settings.py

--HG--
rename : setting_no_askbot.py => settings_no_askbot.py