Add EMAIL_BLACKLIST and EMAIL_FUZZY_MATCH settings.
Add EMAIL_BLACKLIST and EMAIL_FUZZY_MATCH settings.

 * ADD the EMAIL_BLACKLIST setting, which is a list of blacklisted
   (spammer/harvester) email addresses.

 * ADD the EMAIL_FUZZY_MATCH setting, which allows for fuzzy matching of the
   EMAIL_BLACKLIST addresses via the Levenshtein Distance algorithm.

pagea/bridgedb,pagea/bridgedb