replace django-simple-math-captcha with a simple math field (temp. fix per ed)

The django-simple-math-captcha doesn't work if form doesn't pass the validation in the first time.
version bump
add some explanation to captcha question
version bump
directories search update to add option for case sensitive tags
version bump
remove the print statement
Merge branch 'master' into bixly-testing
#786 - Custom Event Notification
Merge branch 'master' into bixly-testing