upper-case email bug fixed (in `BlacklistedDomain.is_blacklisted`)
also improved performance in checking occurrence on the blacklist (in case of a huge blacklist in database)
(profiling of two splitting algorithms: https://gist.github.com/dotsbb/6625771 )
RuntimeError fixed: __unicode__ is aliased to __str__ with `@python_2_unicode_compatible`
python 2.7, django 1.5.4