directory_cleanup update to check if path exists
add error trap in run_nightly_commands
change some code order for event_log's log
no event_log for pingdom
version bump to 5.1.288
pin pillow version to 2.0.0 for the time-being to fix the issue of cutting off image at bottom in diango-simple-captcha

not using the latest version of django-simple-captcha (0.4.1) because it seems to break the venv.
version bump
#787: Admin Bar not working in IE 8
Merge branch 'master' into bixly-testing