In adition to profanities, remove silly or questionable words
thus reducing the possibility of captchas like "killkids" or
"allahlies". I understand that this list is still nowhere near
complete, but at least this is a step in the right direction.
For the reference, the current wordlist used for captcha generation
is http://noc.wikimedia.org/~maxsem/words.txt
(words with anything but lowercase letters also get discarded)
Change-Id: Ic1cb0aa688811886e013bc819866abd745d02f68
If a blacklist is not specified using the '--blacklist' command-line option,
captcha.py will use a default blacklist, included in this patch-set.
Bug: 21025
Change-Id: I93eeaead4a86b38cf5aa0049ac5e61e5b4935b58
